Registering the usercontrol as the toolwindow for the Auto Height of the Docksite Row.

Hi,

How to Registering the usercontrol as the toolwindow for the Auto Height of the Docksite Row WITH DOCKING DIRECTION TO TOP.

I am able to reigister the usercontrol as the toolwindow in the prismintegration with docking with in the Docksite if the Row height of the docksite is Auto and the i am docking the toolwindow in the left direction using toolWindow.Dock(Docksite,Direction.Left).

But  i am NOT able to reigister the usercontrol as the toolwindow in the prismintegration with docking with in the Docksite if the Row height of the docksite is Auto and the i am docking the toolwindow in the TOP direction using toolWindow.Dock(Docksite,Direction.Top).

For Example

i have grid that have three Rows

<Grid Background="#6682b0">

<Grid.RowDefinitions>

<RowDefinition Height="Auto"/>

<RowDefinition Height="*"/>

<RowDefinition Height="Auto"/></Grid.RowDefinitions>

<docking:Dockiste Grid.Row="2"></Docking:Docksite>

How to register the usercontrol as the toolwindow in the docksite in  second row of the grid using prism integration with docking with direction To TOP.