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I have a CExtControlBar derived class that has four CExtButtons displayed.  When I hide docking window and then display the docking window the following hightlighted section of code asserts in the WinProc of the CExtControlBar

LRESULT CExtControlBar::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)

...

case WM_SETFOCUS:

{

LRESULT lResult =

CControlBar::WindowProc(message, wParam, lParam);

if( IsMinimizedOnRow() )

MaximizeOnRow();

if( !IsFixedMode() )

{

CWnd* pWnd = GetWindow(GW_CHILD);

if(pWnd != NULL)

{

pWnd->SetFocus();

#if (!defined __EXT_MFC_NO_TAB_CONTROLBARS)

ASSERT(

pWnd->GetWindow(GW_HWNDNEXT) == NULL

|| IsKindOf(RUNTIME_CLASS(CExtDynTabControlBar))

);

#else

ASSERT(

pWnd->GetWindow(GW_HWNDNEXT) == NULL

);

#endif // else from (!defined __EXT_MFC_NO_TAB_CONTROLBARS)

}

} // if( !IsFixedMode() )

return lResult;

...

}

The resizable control bar is designed to keep only one child window inside. So it’s wrong to create several windows inside CExtControlBar and that’s why you encountered the assertion. Please create a child dialog with buttons and then use it as a child window of the resizable control bar.