MenuBarItem with icon

[limeniye]

I`am trying to do MenuBarItem with icon.

But for MenuBarItem I don't have a Header or Icon property.
How can I resolve this problem?
Currently I'am using Expander, but that's not what I`am expecting for.

[limeniye]

Currently I'am in the following state:

1. I installed CommunityToolkit Behaviors

	<ItemGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">
		<PackageReference Include="CommunityToolkit.WinUI.UI.Behaviors" />
	</ItemGroup>
	<ItemGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) != 'windows'">
		<PackageReference Include="Uno.CommunityToolkit.WinUI.UI.Behaviors" />
	</ItemGroup>

	<PropertyGroup>
		<CommunityToolkitVersion>7.1.2</CommunityToolkitVersion>
		<UnoCommunityToolkit>7.1.200-dev.6.gf657bb2e91</UnoCommunityToolkit>
	</PropertyGroup>		

2. I wrote custom ShowAttachedFlyoutBehavior

public class ShowAttachedFlyoutBehavior
	: BehaviorBase<FrameworkElement>
{
	protected override bool Initialize()
	{
		var result = ShowAttachedFlyout();
		return result;
	}

	protected override bool Uninitialize()
	{
		HideAttachedFlyout();
		return true;
	}

	private bool ShowAttachedFlyout()
	{
		if (AssociatedObject == null)
		{
			return false;
		}
		FlyoutBase.ShowAttachedFlyout(AssociatedObject);
		return true;
	}

	private void HideAttachedFlyout()
	{
		FlyoutBase.GetAttachedFlyout(AssociatedObject).Hide();
	}
}

And I'am trying to execute it with a following code:

<Grid x:Name="AddNewGrid" ColumnDefinitions="70,Auto,20" Height="{Binding ElementName=NavigationPanel, Path=ActualHeight}">
	<FlyoutBase.AttachedFlyout>
		<MenuFlyout>
			<MenuFlyoutItem Text="UDP"/>
			<MenuFlyoutItem Text="TCP"/>
		</MenuFlyout>
	</FlyoutBase.AttachedFlyout>
	<i:Interaction.Behaviors>
		<core:EventTriggerBehavior EventName="Tapped" SourceObject="{Binding ElementName=AddNewGrid}">
			<behaviors:ShowAttachedFlyoutBehavior/>
		</core:EventTriggerBehavior>
	</i:Interaction.Behaviors>
	<TextBlock Grid.Column="1" Text="New" VerticalAlignment="Center"/>
</Grid>

But on deploy I have the following error:

Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll
The text associated with this error code could not be found.

If I will remove this line <behaviors:ShowAttachedFlyoutBehavior/> the page will displayed.

[limeniye]

@jeromelaban, I created a simple repo for this issue:

https://github.com/limeniye/UnoCustomBehaviorParsingError

UnoCustomBehaviorParsingError-main.zip

[jeromelaban]

Thanks. Have you tried a more recent build of the community toolkit to see if it helps?

[limeniye]

The version <CommunityToolkitVersion>7.1.2</CommunityToolkitVersion> Its the last version and also it hasn't .dev versions.

https://www.nuget.org/packages/CommunityToolkit.WinUI.UI.Behaviors#versions-body-tab

[jeromelaban]

Thanks. Then there's an error to report to create on the community toolkit report.

[limeniye]

https://github.com/CommunityToolkit/WindowsCommunityToolkit/discussions/4927