Hello,

Add the following code to your CChildFrame class to eliminate the flicker you see when switching MDI tabs:

BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)
{
    // make sure view is maximum size to eliminate
    // flicker when switching tabs.
    cs.x =
    cs.y = 0;
   
    cs.cx =
    cs.cy = 32767;

    // TODO: Modify the Window class or styles here by modifying
    // the CREATESTRUCT cs
    if( !CXTMDIChildWnd::PreCreateWindow(cs) )
        return FALSE;

    cs.style |= WS_CLIPCHILDREN;
    cs.style = WS_CHILD | WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU
        | FWS_ADDTOTITLE | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX;

    return TRUE;
}

void CChildFrame::ActivateFrame(int nCmdShow)
{
    // first window should be maximized
    if (GetParent()->GetWindow(GW_CHILD) == this)
    {
        nCmdShow = SW_SHOWMAXIMIZED;
    }

    CXTMDIChildWnd::ActivateFrame(nCmdShow);
}

I was running the demo MDITabDemo (also occurs on other demo programs that support the tabbed MDI style) and noticed that eery time a tab for an unexposed window is clicked, there is a very brief flicker where an MDI child window shows itself in the "Restored" state just prior to maximizing and showing in the "Tabbed" state.

I also noticed that the Tabbed MDI seems to be implemented by piggybacking on top of regular MDI, such that the child windows can be "Restored" to what is basically regular MDI mode with the tab bar serving as a mechanism to front windows.  This is not the behavior of Tabbed MDI in Visual Studio.  Is it possible to eliminate this feature (and along with it eliminating both the MDI child menu additions to the main frame menu) and will doing so eliminate the flicker, or would I need to implement my own Tabbed MDI (basically doing so in SDI mode I imagine)?