update message inside GS articles for TreeView, TDG and DG.

Author: didiyordanova

controls/datagrid/getting-started.md

@@ -63,10 +63,14 @@ public static class MauiProgram
 
 ## Visualize Sample Data
 
-The DataGrid provides UI virtualization, so it requires its visual parent to provide vertical or horizontal space for the control to fit into. The following scenarios will measure the DataGrid with infinite width and height constraints and the virtualization will not work:
+The DataGrid uses UI virtualization and requires its parent container to provide a defined vertical or horizontal space. Virtualization will not work if the DataGrid is measured with infinite width or height. 
 
-* Positioning the DataGrid inside a `StackLayout` which is wrapped in a ScrollView.
-* Positioning the DataGrid inside a ScrollView.
+Avoid placing the DataGrid in the following layouts, as this will prevent virtualization from functioning:
+
+* Do not place the DataGrid inside a `StackLayout` that is wrapped in a `ScrollView`.
+* Do not place the DataGrid directly inside a `ScrollView`.
+
+Place the DataGrid control inside a `Grid` layout with a row height set to `*` (star) or a specific value.
 
 Now that you have added the control to your view, you need to make sure that is properly loaded with the required data.
 

controls/treedatagrid/getting-started.md

@@ -26,10 +26,14 @@ Before adding the TreeDataGrid, you need to:
 
 ## Define the Control
 
-The TreeDataGrid provides UI virtualization, so it requires its visual parent to provide vertical or horizontal space for the control to fit into. The following scenarios will measure the TreeDataGrid with infinite width and height constraints and the virtualization will not work:
+The TreeDataGrid uses UI virtualization and requires its parent container to provide a defined vertical or horizontal space. Virtualization will not work if the TreeDataGrid is measured with infinite width or height. 
 
-* Positioning the TreeDataGrid inside a `StackLayout` which is wrapped in a `ScrollView`.
-* Positioning the TreeDataGrid inside a `ScrollView` or controls with internal scrolling.
+Avoid placing the TreeDataGrid in the following layouts, as this will prevent virtualization from functioning:
+
+* Do not place the TreeDataGrid inside a `StackLayout` that is wrapped in a `ScrollView`.
+* Do not place the TreeDataGrid directly inside a `ScrollView`.
+
+Place the TreeDataGrid control inside a `Grid` layout with a row height set to `*` (star) or a specific value.
 
 By default, the TreeDataGrid auto-generates rows depending on the number of objects in the collection set as its `ItemsSource`.
 

controls/treeview/getting-started.md

@@ -31,10 +31,14 @@ Before adding the TreeView, you need to:
 
 When your .NET MAUI application is set up, you are ready to add a TreeView control to your page. The following example shows a sample TreeView definition populated with sample data.
 
-The TreeView provides UI virtualization, which requires the visual parent to provide vertical or horizontal space. To avoid breaking UI virtualization or gesture mechanisms:
+The TreeView uses UI virtualization and requires its parent container to provide a defined vertical or horizontal space. Virtualization will not work if the TreeView is measured with infinite width or height. 
 
-* Do not place the TreeView inside a `StackLayout` or inside a `ScrollView`.
-* Do not set the TreeView to a `RowDefinition Height="Auto"` Grid definition.
+Avoid placing the TreeView in the following layouts, as this will prevent virtualization from functioning:
+
+* Do not place the TreeView inside a `StackLayout` that is wrapped in a `ScrollView`.
+* Do not place the TreeView directly inside a `ScrollView`.
+
+Place the TreeView control inside a `Grid` layout with a row height set to `*` (star) or a specific value.
 
 **1.** Set up the `RadTreeView` instance: