[XAML]
<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>
<TextBlock Margin="10" DockPanel.Dock="Top"
Name="txt1"/>