Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

I have two contentPanes inside a SplitPane on top of each other (SplitterOrientation="Horizontal"  ).  When resizing the main window I want the bottom ContentPane to have a fixed size, but the top contentPane has a relative size to the height of the main window.  How can I  do it in xaml?

Thanks,

My Code:

<igDock:SplitPane igDock:XamDockManager.InitialLocation="DockedRight" Width="225" x:Name="splitPaneRight" SplitterOrientation="Horizontal"  >

         <igDock:ContentPane x:Name="experimentExplorerPane"  Header="Experiment Explorer" CloseAction="HidePane" Closed="WindowPane_Closed" Image="Images\solution_explorer.png">

       </igDock:ContentPane>

                        <igDock:ContentPane x:Name="miniPlatePanel" Height="280"  VerticalAlignment="Top" Header="Mini Plate" CloseAction="HidePane"  Closed="WindowPane_Closed" Image="Images\MiniPlateIcon18.png">

                  // a user control

                        </igDock:ContentPane>

                       </igDock:SplitPane>