In MFC, is it permitted to make a class derived from CFrameWnd a child of another class derived from CFrameWnd?

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MFC

In MFC, is it permitted to make a class derived from CFrameWnd a child of another class derived from CFrameWnd?


I needed dialigue boxes with split CFormView windows, but soon found out that split windows are possible with only classes that have an OnCreateClient member function so I decided to use a framed window and call BeginModal state in its constructor to convert it to a modal dialogue box before proceeding with window splitting.
What I am not sure of is if this a legal opetation.