nested splitter window

Hi, I want to create the following splitters. 1. ParentSplitter - 2 cols and 1 row (vertical split) - derives from CFrameWnd-SDI based - 1st pane has a class derived from CTreeView (so this will be SDI-based) - 2nd pane should be ChildSplitter 2. ChildSplitter - 2 rows and 1 col (horizontal split) - derives from CMDIChildWnd-MDI based - 1st pane and 2nd pane will derive from CFormView So basically I want the parent to be SDI-based as its 1st pane (the TreeView) is SDI-based but its 2nd pane needs to be a MDI-based splitter. Can this be done? .. or is there any work-around for this concept .. If so can anyone plz guide me ... thanks a lot