Hello Mark K.,
This are not supported features of DockingManager. The target of our docking component is to have full support of ToolWindows, TabbedDocuments behavior like Visual Studio.
For this scenario, you must handle SpliterMoving/SplitterMoved events and when you change two panel also you should update the other two panels. When you want one panel to cover the whole area you must Hide other panels with the Hide
method and respectively use Show
for showing them afterwards.
This is an interesting functionality, and it could be a good idea to add a new splitter layout control to our suite. We will make research for possible implementation in our future releases.
the Telerik team