Grid with SharedSizeGroup
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Title="About WPF" Background="OrangeRed"> <Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" IsSharedSizeScope="True"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" SharedSizeGroup="myGroup"/> <ColumnDefinition/> <ColumnDefinition SharedSizeGroup="myGroup"/> </Grid.ColumnDefinitions> <Label Grid.Column="0" Background="Red" HorizontalContentAlignment="Center" VerticalContentAlignment="Center">1</Label> <GridSplitter Grid.Column="0" Width="5"/> <Label Grid.Column="1" Background="Orange" HorizontalContentAlignment="Center" VerticalContentAlignment="Center">2</Label> <Label Grid.Column="2" Background="Yellow" HorizontalContentAlignment="Center" VerticalContentAlignment="Center">3</Label> </Grid> </Window>