title: Silverlight Grid Splitter Unexpected Behaviour
body: <p>I am just starting out on Silverlight using version 2.0. I wanted to show a few data grids on the page and got this going OK by dropping each into a grid cell. I then thought I would try adding a grid splitter using the following markup:</p>
  
  <pre><code>&lt;UserControl xmlns:basics="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"  xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"  x:Class="SilverlightApplication1.Page"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
   Loaded="UserControl_Loaded"&gt;
      &lt;Grid x:Name="LayoutRoot" Background="White"&gt;
          &lt;Grid.ColumnDefinitions&gt;
              &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt;
              &lt;ColumnDefinition Width="Auto"&gt;&lt;/ColumnDefinition&gt;
              &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt;
          &lt;/Grid.ColumnDefinitions&gt;
          &lt;Grid.RowDefinitions&gt;
              &lt;RowDefinition&gt;&lt;/RowDefinition&gt;
              &lt;RowDefinition&gt;&lt;/RowDefinition&gt;
          &lt;/Grid.RowDefinitions&gt;
          &lt;basics:GridSplitter Grid.RowSpan="2" Grid.Row="0" Grid.Column="1" HorizontalAlignment="Left" Width="5" VerticalAlignment="Stretch" &gt;&lt;/basics:GridSplitter&gt;
          &lt;data:DataGrid Name="TLGrid" Grid.Row="0" Grid.Column="0"&gt;
          &lt;/data:DataGrid&gt;
          &lt;data:DataGrid Name="TRGrid" Grid.Row="0" Grid.Column="2"&gt;
          &lt;/data:DataGrid&gt;
          &lt;data:DataGrid Name="BLGrid" Grid.Row="1" Grid.Column="0"&gt;
          &lt;/data:DataGrid&gt;
          &lt;data:DataGrid Name="BRGrid" Grid.Row="1" Grid.Column="2"&gt;
          &lt;/data:DataGrid&gt;
      &lt;/Grid&gt;
  &lt;/UserControl&gt;
  </code></pre>
  
  <p>I expected to be able to drag the splitter around to resize the other two columns. When I drag the bar, both of the other columns shrink. Can anyone explain why?</p>