<Window x:Class="LayoutPanels.SplitWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="SplitWindow" Height="300" Width="300"
    >
    <Grid>
      <Grid.RowDefinitions>
        <RowDefinition></RowDefinition>
        <RowDefinition></RowDefinition>
      </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
        <ColumnDefinition MinWidth="100"></ColumnDefinition>
        <ColumnDefinition Width="Auto"></ColumnDefinition>
        <ColumnDefinition MinWidth="50"></ColumnDefinition>
      </Grid.ColumnDefinitions>

      <Button Grid.Row="0" Grid.Column="0" Margin="3">Left</Button>
      <Button Grid.Row="0" Grid.Column="2" Margin="3">Right</Button>
      <Button Grid.Row="1" Grid.Column="0" Margin="3">Left</Button>
      <Button Grid.Row="1" Grid.Column="2" Margin="3">Right</Button>
      
      <GridSplitter Grid.Row="0" Grid.Column="1" Grid.RowSpan="2"                
                  Width="3" VerticalAlignment="Stretch" HorizontalAlignment="Center"
                  ShowsPreview="False"></GridSplitter>
     
    </Grid>
</Window>
