How to access the e.control's parent?

[Romuca]

Question

I'm newbie to Flet and I'm facing a problem.
I have a Column that contains a Row and a TextField. This Row includes some text and a Dropdown. When this Dropdown changes value, I need to make the TextField enabled, but the documentation does not tell how to access the parent at e.control (or am I too dumb).
Pls help.

Code sample

Column(
                        [
                            Row(
                                [
                                    Text("0", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )

Error message

No response

------------------------------------------------------

• I have searched for answers to my question both in the issues and in previous discussions.

[ndonkoHenri]

e.control is a Flet control, so to acces its parent simply do e.control.parent
Detailed Article: https://python.plainenglish.io/access-any-controls-parent-flet-98e2c60dfab8

[Romuca]

There will be a lot of code here, probably not very good, but it works like this: I have 3 tabs, a window with two containers pops up on the second tab. In the first container I select the device, in the second container I select the device category to configure. And after that, instead of selecting a device, a large column appears in which there are ports for connecting devices, Dropdowns in which you can select a specific type of device, and a text field in which you can enter the name of the device. Initially, this text field is disabled, but I need to check if Dropdown does not have a value of Nothing in the corresponding port, then the text field should be enabled. I guess this can be done if I get access to the parent of this Dropdown, but maybe it's not.

Variable:

_digital_devices_tile_column = Column(
        [
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("0", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("1", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("2", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("3", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
        expand=True,
        scroll="auto"
    )

Column and container system:

    def tile_clicked(e):
    if _configure_device_column.controls[1].value != "No devices selected":
        _select_device_to_configure_container.content.controls.clear()
        _select_device_to_configure_container.content.controls.append(_edit_configuration_column)
        _select_device_to_configure_container.content.controls[0].controls[0].controls.append(
            _config_control_buttons)
        _edit_configuration_column.controls[0].controls[0].value = e.control.title.value
        _configure_device_column.controls[1].color = ColorScheme.primary
    else:
        _configure_device_column.controls[1].color = "#ce2029"

    if len(_edit_configuration_column.controls) > 1:
        _edit_configuration_column.controls.pop()

    if device_configure_title.value == "Motors":
        _edit_configuration_column.controls.append(_motor_tile_row)
    elif device_configure_title.value == "Servos":
        _edit_configuration_column.controls.append(_servo_tile_row)
    elif device_configure_title.value == "Digital Devices":
        _edit_configuration_column.controls.append(_digital_devices_tile_row)

    page.update()

_device_list_column = Column(
    [
        configure_motors,
        Divider(thickness=2, height=8),
        configure_servos,
        Divider(thickness=2, height=8),
        configure_dig_devices,
        Divider(thickness=2, height=8),
        configure_pvm,
        Divider(thickness=2, height=8),
        configure_analog,
        Divider(thickness=2, height=8),
        configure_i2c0,
        Divider(thickness=2, height=8),
        configure_i2c1,
        Divider(thickness=2, height=8),
        configure_i2c2,
        Divider(thickness=2, height=8),
        configure_i2c3
    ],
    alignment=MainAxisAlignment.CENTER,
    horizontal_alignment=CrossAxisAlignment.CENTER,
    expand=True,
    scroll="auto"
)

_configure_device_column = Column(
    [
        device_configure_title,
        device_name_during_configuration,
        _device_list_column
    ],
    alignment=MainAxisAlignment.CENTER,
    horizontal_alignment=CrossAxisAlignment.CENTER,
    expand=True,
)

configure_dig_devices = ListTile(
    title=ft.Text("Digital Devices"),
    subtitle=ft.Text("Configure Digital Devices"),
    on_click=tile_clicked
)

_edit_configuration_column = Column(
    [
        Column([device_configure_title]),
    ],
    expand=True,
)

_select_device_to_configure_container = Container(
    border=border.all(width=4, color="#b5b5b5"),
    width=page.window_width / 2.5,
    height=page.window_height - 250,
    border_radius=20,
    padding=20,
    adaptive=True,
    content=_select_device_to_configure_column,
    shadow=BoxShadow(
        spread_radius=1,
        blur_radius=15,
        color=ft.colors.BLUE_GREY_300,
        offset=ft.Offset(0, 0),
        blur_style=ft.ShadowBlurStyle.OUTER,
    ),
)

_configure_device_container = Container(
    border=border.all(width=4, color="#b5b5b5"),
    width=page.window_width / 2.5,
    height=page.window_height - 250,
    border_radius=20,
    padding=20,
    adaptive=True,
    content=_configure_device_column,
    shadow=BoxShadow(
        spread_radius=1,
        blur_radius=15,
        color=ft.colors.BLUE_GREY_300,
        offset=ft.Offset(0, 0),
        blur_style=ft.ShadowBlurStyle.OUTER,
    ),
)

It's how this code working:

_2024_05_24_20_52_55_77.mp4

[ndonkoHenri]

Sorry but I wont be able to look at it.
Will be nice if you could take some time to build a repro of the issue that i can run.

[Romuca]

Try running the following code:

1. Click on the left container on the Expansion Hub Title
2. Click on the right container on the Digital Devices Tile
3. Change the value of any Dropdown. You will see the error that the Dropdown object has no attribute parent. I would like to know how to fix this or how to get access to parent from control in another way.

Code

from flet import *


def main(page: Page):
    selected_device = "none"
    page.fonts = {
        "MontserratRegular": "fonts\Montserrat-Regular.ttf",
        "MontserratRegularBoldItalic": "fonts\Montserrat-BoldItalic.ttf",
        "InterMedium": "fonts\Inter-Medium.ttf",
        "RubikRegular": "fonts\Rubik-Regular.ttf"
    }

    page.window_resizable = True
    page.window_maximized = True
    page.window_min_height = 650
    page.window_min_width = 450

    page.bgcolor = "#0a0a0a"
    page.title = "MyProgram"
    page.theme_mode = 'dark'
    page.horizontal_alignment = CrossAxisAlignment.CENTER
    page.vertical_alignment = MainAxisAlignment.CENTER

    def configuration_dropdown_changed(e):
        print(e.control.parent)

    def device_tile_clicked(e):
        e.control.title.color = "#f4c430"
        selected_device = e.control.title.value

        _configure_device_column.controls[1].value = selected_device
        _configure_device_column.controls[1].color = ColorScheme.primary

        if selected_device == "Control Hub":
            _home_create_body.controls[0].tabs[0].content.controls[1].content.controls[
                1].title.color = ColorScheme.primary
        else:
            _home_create_body.controls[0].tabs[0].content.controls[1].content.controls[
                2].title.color = ColorScheme.primary
        page.update()

    def tile_clicked(e):
        if _configure_device_column.controls[1].value != "No devices selected":
            _select_device_to_configure_container.content.controls.clear()
            _select_device_to_configure_container.content.controls.append(_edit_configuration_column)
            _select_device_to_configure_container.content.controls[0].controls[0].controls.append(
                _config_control_buttons)
            device_configure_title.value = e.control.title.value
            _configure_device_column.controls[1].color = ColorScheme.primary
        else:
            _configure_device_column.controls[1].color = "#ce2029"

        if len(_edit_configuration_column.controls) > 1:
            _edit_configuration_column.controls.pop()

        if device_configure_title.value == "Motors":
            _edit_configuration_column.controls.append(_motor_tile_row)
        elif device_configure_title.value == "Servos":
            _edit_configuration_column.controls.append(_servo_tile_row)
        elif device_configure_title.value == "Digital Devices":
            _edit_configuration_column.controls.append(_digital_devices_tile_row)

        page.update()

    device_configure_title = Text("Configure Device:", font_family="InterMedium", size=20)

    _edit_configuration_column = Column(
        [
            Column([device_configure_title]),
        ],
        expand=True,
    )

    save_configuration = ElevatedButton(icon=icons.SAVE_SHARP, color="#fad201", text="Save")
    cancel_configuration = ElevatedButton(color="#fad201", text="Cancel")

    _config_control_buttons = Row(
        [
            save_configuration,
            cancel_configuration
        ],
    )

    _motor_tile_row = Column(
        [
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("0", size=18, font_family="InterMedium"),
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("1", size=18, font_family="InterMedium"),
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("2", size=18, font_family="InterMedium"),
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("3", size=18, font_family="InterMedium"),
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
        ],
        expand=True,
        scroll="auto"
    )

    _servo_tile_row = Column(
        [
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("0", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Continuous Rotation Servo"),
                                            dropdown.Option("REV Blinkin LED Driver"),
                                            dropdown.Option("REV SPARKmini Controller"),
                                            dropdown.Option("Servo")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("1", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Continuous Rotation Servo"),
                                            dropdown.Option("REV Blinkin LED Driver"),
                                            dropdown.Option("REV SPARKmini Controller"),
                                            dropdown.Option("Servo")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("2", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Continuous Rotation Servo"),
                                            dropdown.Option("REV Blinkin LED Driver"),
                                            dropdown.Option("REV SPARKmini Controller"),
                                            dropdown.Option("Servo")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("3", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Continuous Rotation Servo"),
                                            dropdown.Option("REV Blinkin LED Driver"),
                                            dropdown.Option("REV SPARKmini Controller"),
                                            dropdown.Option("Servo")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("4", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Continuous Rotation Servo"),
                                            dropdown.Option("REV Blinkin LED Driver"),
                                            dropdown.Option("REV SPARKmini Controller"),
                                            dropdown.Option("Servo")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("5", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Continuous Rotation Servo"),
                                            dropdown.Option("REV Blinkin LED Driver"),
                                            dropdown.Option("REV SPARKmini Controller"),
                                            dropdown.Option("Servo")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
        ],
        expand=True,
        scroll="auto"
    )

    _digital_devices_tile_row = Column(
        [
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("0", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("1", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("2", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("3", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("4", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("5", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("6", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
            Divider(thickness=20),
            Row(
                [
                    Column(
                        [
                            Row(
                                [
                                    Text("7", size=18, font_family="InterMedium"),
                                    Dropdown(
                                        options=[
                                            dropdown.Option("Nothing"),
                                            dropdown.Option("Digital Device"),
                                            dropdown.Option("LED"),
                                            dropdown.Option("REV Touch Sensor")
                                        ],
                                        value="Nothing",
                                        on_change=configuration_dropdown_changed
                                    )
                                ]
                            ),
                            TextField(label="Enter a device name")
                        ]
                    )
                ]
            ),
        ],
        expand=True,
        scroll="auto"
    )

    configure_motors = ListTile(
        title=Text("Motors"),
        subtitle=Text("Configure Motors"),
        on_click=tile_clicked
    )

    configure_servos = ListTile(
        title=Text("Servos"),
        subtitle=Text("Configure Servos"),
        on_click=tile_clicked
    )

    configure_dig_devices = ListTile(
        title=Text("Digital Devices"),
        subtitle=Text("Configure Digital Devices"),
        on_click=tile_clicked
    )

    configure_pvm = ListTile(
        title=Text("PVM Devices"),
        subtitle=Text("Configure PVM Devices"),
        on_click=tile_clicked
    )

    configure_analog = ListTile(
        title=Text("Analog Input Devices"),
        subtitle=Text("Configure Analog Input Devices"),
        on_click=tile_clicked
    )

    configure_i2c0 = ListTile(
        title=Text("I2C Bus 0"),
        subtitle=Text("Configure I2C Bus 0"),
        on_click=tile_clicked
    )

    configure_i2c1 = ListTile(
        title=Text("I2C Bus 1"),
        subtitle=Text("Configure I2C Bus 1"),
        on_click=tile_clicked
    )

    configure_i2c2 = ListTile(
        title=Text("I2C Bus 2"),
        subtitle=Text("Configure I2C Bus 2"),
        on_click=tile_clicked
    )

    configure_i2c3 = ListTile(
        title=Text("I2C Bus 3"),
        subtitle=Text("Configure I2C Bus 3"),
        on_click=tile_clicked
    )

    _device_list_column = Column(
        [
            configure_motors,
            Divider(thickness=2, height=8),
            configure_servos,
            Divider(thickness=2, height=8),
            configure_dig_devices,
            Divider(thickness=2, height=8),
            configure_pvm,
            Divider(thickness=2, height=8),
            configure_analog,
            Divider(thickness=2, height=8),
            configure_i2c0,
            Divider(thickness=2, height=8),
            configure_i2c1,
            Divider(thickness=2, height=8),
            configure_i2c2,
            Divider(thickness=2, height=8),
            configure_i2c3
        ],
        alignment=MainAxisAlignment.CENTER,
        horizontal_alignment=CrossAxisAlignment.CENTER,
        expand=True,
        scroll="auto"
    )

    device_name_during_configuration = Text("No devices selected")
    select_device_to_configure_title = Text("Select a device to configure:", font_family="InterMedium", size=20)
    device_configure_title = Text("Configure Device:", font_family="InterMedium", size=20)

    _expansion_hub_tile = CupertinoListTile(
        leading=Icon(name=icons.SMARTPHONE),
        title=Text("Expansion Hub"),
        subtitle=Text("Click on tile to continue >>>"),
        on_click=device_tile_clicked,
        notched=True
    )

    _control_hub_tile = CupertinoListTile(
        leading=Icon(name=icons.SMARTPHONE),
        title=Text("Control Hub"),
        subtitle=Text("Click on tile to continue >>>"),
        on_click=device_tile_clicked,
        notched=True
    )

    _configure_device_column = Column(
        [
            device_configure_title,
            device_name_during_configuration,
            _device_list_column
        ],
        alignment=MainAxisAlignment.CENTER,
        horizontal_alignment=CrossAxisAlignment.CENTER,
        expand=True,
    )

    _select_device_to_configure_column = Column(
        [
            select_device_to_configure_title,
            _expansion_hub_tile,
            _control_hub_tile
        ],
        alignment=MainAxisAlignment.CENTER,
        horizontal_alignment=CrossAxisAlignment.CENTER,
        expand=True
    )

    _select_device_to_configure_container = Container(
        border=border.all(width=4, color="#b5b5b5"),
        width=page.window_width / 2.5,
        height=page.window_height - 250,
        border_radius=20,
        padding=20,
        adaptive=True,
        content=_select_device_to_configure_column,
        shadow=BoxShadow(
            spread_radius=1,
            blur_radius=15,
            color=colors.BLUE_GREY_300,
            offset=Offset(0, 0),
            blur_style=ShadowBlurStyle.OUTER,
        ),
    )

    _configure_device_container = Container(
        border=border.all(width=4, color="#b5b5b5"),
        width=page.window_width / 2.5,
        height=page.window_height - 250,
        border_radius=20,
        padding=20,
        adaptive=True,
        content=_configure_device_column,
        shadow=BoxShadow(
            spread_radius=1,
            blur_radius=15,
            color=colors.BLUE_GREY_300,
            offset=Offset(0, 0),
            blur_style=ShadowBlurStyle.OUTER,
        ),
    )

    create_program_tabs = Tabs(
        selected_index=0,
        animation_duration=300,
        scrollable=False,
        tabs=[
            Tab(
                text="Configuration",
                content=Row(
                    controls=[
                        VerticalDivider(width=100, color="surface,0"),
                        _select_device_to_configure_container,
                        _configure_device_container,
                        VerticalDivider(width=100, color="surface,0")
                    ],
                    alignment=MainAxisAlignment.CENTER,
                    vertical_alignment=CrossAxisAlignment.CENTER
                )
            ),
        ],
        expand=1,
    )

    _home_create_body = Row(
        [
            create_program_tabs
        ],
        expand=True,
        alignment=MainAxisAlignment.CENTER,
        vertical_alignment=CrossAxisAlignment.CENTER
    )

    def change_route(e: RouteChangeEvent):
        page.views.clear()

        page.views.append(
            View(
                route='/start',
                controls=[
                    AppBar(
                        bgcolor=colors.SURFACE_VARIANT,
                        # trailing=IconButton(icons.CLOSE, on_click=exit_app),
                        # middle=home_title,
                    ),
                    _home_create_body
                ],
                vertical_alignment=MainAxisAlignment.CENTER,
                horizontal_alignment=CrossAxisAlignment.CENTER,
                spacing=25
            )
        )

        page.update()

    page.on_route_change = change_route
    page.go(page.route)

    page.update()


if __name__ == '__main__':
    app(target=main, assets_dir="assets")

[ndonkoHenri]

I get Row printed out, which is correct.
Please update your Flet version to the latest.

[Romuca]

I do not know why Flet did not update before the discussion opened, but I decided to try again, and it worked! Thank you so much for your responsiveness and I'm sorry that I had to come all this way to solve such a ridiculous problem.