Fixed Docking Index

Hi,

When a window is docked, is there a way to force the window to always be the first tab.
For example, in the following xaml, no matter how many windows are docked and colapsed to the right, I always want FwSearchWindow to be the first tab.

Can you think of a way of achieving this?

<controls:FwDockSite x:Name="CentreWorkspaceRegionPanel" Grid.Row="0" Background="Transparent">
<docking:Workspace>
<docking:TabbedMdiHost>
</docking:TabbedMdiHost>
</docking:Workspace>
<docking:DockSite.AutoHideRightContainers>
<docking:ToolWindowContainer>
<controls:FwSearchWindow x:Name="RightWorkspaceRegionPanel" Visibility="Hidden" IsEnabled="False" Title="Test" CanAttach="False" CanAutoHide="True" CanBecomeDocument="False" CanClose="False" CanDockBottom="False" CanDockLeft="False" CanDockRight="True" CanDockTop="False" CanDrag="False" CanRaft="False" HasTitleBar="True">

</controls:FwSearchWindow>
</docking:ToolWindowContainer>
</docking:DockSite.AutoHideRightContainers>

</controls:FwDockSite>