In order to change the docked position of a specific RadSplitContainer
you should set the InitialPosition
property of that container.
The next code snippet shows how to dock the RadSplitContainer with x:Name="splitContainer"
to the bottom:
.splitContainer.InitialPosition = Telerik.Windows.Controls.Docking.DockState.DockedBottom;
Hope this is helpful.
the Telerik team