MFC MDI tab control caption changing

This solution applies only when your report windows are derived from CFrameWnd.

The basic window title of CFrameWnd and CDocument classes is stored in the member variable m_strTitle which can be set and retrieved with the virtual functions SetTitle() and GetTitle(). So you should use SetTitle() to change the title or overwrite the function. Note that this will only change the member variable. You must still call SetWindowText(). The member variable is initialized by Create() with the window name passed to Create().

If not using SetTitle(), the on screen title will be updated using the m_strTitle text.

Another point that must be observed is the automatic creation of frame windows. CFrameWnd windows created by document templates have the implicit style FWS_ADDTOTITLE. When this style is set, the title is updated each time when an internal idle flag is set. To remove the flag, overwrite PreCreateWindow() of your frame window class:

BOOL CMyFrame::PreCreateWindow(CREATESTRUCT& cs)
{
    // Style FWS_ADDTOTITLE is always set when creating a frame window.
    // See CDocTemplate::CreateNewFrame() in doctmpl.cpp
    cs.style &= ~FWS_ADDTOTITLE;
    // Change CFrameWnd to the base class if necessary
    return CFrameWnd::PreCreateWindow(cs);
}