how to access Document in CMainFrame

Hi everyone,

I'm a new comer in using Xtreme Toolkit software.  I meet a problem with the UI development now. I used the demo codes which implements with outlook-style UI for the framework. And I want to  add some buttons in the toolbar to process some data in Doc.h, But I can't get the pointer to C**Doc class . Since CMainFrame class in this demo project is derived from CXTPFrameWnd, which seems not derived from MFC. So when I write

CWnd* pWnd= AfxGetMainWnd();

CMainFrame* pMainFrame= pWnd->GetParentFrame();

It doesn't wok well. pMainFrame always returns NULL. So I couldn't access Doc class by this way

C**Doc*  pDoc= pMainFrame->GetActiveDocument();

How could I get the reference to the frame window for this situation ?Hope anyone could give me a hand.

Thanks  very much,

thank you very much,it works

and how can I reference to Doc class by this pMainFrame pointer?

CMainFrame is derived from CXTPFrameWnd class which is not just like CFrameWnd class offered methods of accessing Doc class.

or there are some other ways to solve it?