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Use the IsSharedSizeScope attached property of the Grid element

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="grid_issharedsizescope_prop.Window1"     Title="Grid IsSharedSizeScope Sample">     <Border BorderBrush="Black" Background="White" BorderThickness="2">   <DockPanel Name="dp1" Grid.IsSharedSizeScope="False" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10">     <StackPanel Orientation="Horizontal" DockPanel.Dock="Top">           <Button Click="setTrue" Margin="0,0,10,10">Set IsSharedSizeScope="True"</Button>         <Button Click="setFalse" Margin="0,0,10,10">Set IsSharedSizeScope="False"</Button>     </StackPanel>      <StackPanel Orientation="Horizontal" DockPanel.Dock="Top">       <Grid ShowGridLines="True" Margin="0,0,10,0">       <Grid.ColumnDefinitions>         <ColumnDefinition SharedSizeGroup="FirstColumn"/>         <ColumnDefinition SharedSizeGroup="SecondColumn"/>       </Grid.ColumnDefinitions>       <Grid.RowDefinitions>         <RowDefinition Height="Auto" SharedSizeGroup="FirstRow"/>       </Grid.RowDefinitions>         <Rectangle Fill="Silver" Grid.Column="0" Grid.Row="0" Width="200" Height="100"/>         <Rectangle Fill="Blue" Grid.Column="1" Grid.Row="0" Width="150" Height="100"/>         <TextBlock Grid.Column="0" Grid.Row="0" FontWeight="Bold">First Column</TextBlock>         <TextBlock Grid.Column="1" Grid.Row="0" FontWeight="Bold">Second Column</TextBlock>     </Grid>     <Grid ShowGridLines="True">       <Grid.ColumnDefinitions>         <ColumnDefinition SharedSizeGroup="FirstColumn"/>         <ColumnDefinition SharedSizeGroup="SecondColumn"/>       </Grid.ColumnDefinitions>       <Grid.RowDefinitions>                 <RowDefinition Height="Auto" SharedSizeGroup="FirstRow"/>       </Grid.RowDefinitions>         <Rectangle Fill="Silver" Grid.Column="0" Grid.Row="0"/>         <Rectangle Fill="Blue" Grid.Column="1" Grid.Row="0"/>           <TextBlock Grid.Column="0" Grid.Row="0" FontWeight="Bold">First Column</TextBlock>         <TextBlock Grid.Column="1" Grid.Row="0" FontWeight="Bold">Second Column</TextBlock>     </Grid>          </StackPanel>   </DockPanel>   </Border>   </Window> //File:Window.xaml.vb Imports System Imports System.Windows Imports System.Windows.Controls Namespace grid_issharedsizescope_prop   Public Partial Class Window1     Inherits Window     Public Sub setTrue(sender As Object, e As System.Windows.RoutedEventArgs)       Grid.SetIsSharedSizeScope(dp1, True)       Console.WriteLine(Grid.GetIsSharedSizeScope(dp1).ToString())     End Sub     Public Sub setFalse(sender As Object, e As System.Windows.RoutedEventArgs)       Grid.SetIsSharedSizeScope(dp1, False)       Console.WriteLine(Grid.GetIsSharedSizeScope(dp1).ToString())     End Sub   End Class End Namespace