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In our code we have CExtTabWnd-derived class for CExtTabPageContainerWnd-derived container. New dialogs are created during the execution and populated as tabs using PageInsert. It is possible to click on Tabs button and get a popup with a list of all tabs added. But sometimes when such popup is open and a new dialog is created the application crashes trying to dereference a pointer to a deleted popup.



A piece from CExtPopupMenuWnd::_TrackPopupMenu:

    ASSERT_VALID( this );
    m_bCanceling = false;

    CExtPaintManager::stat_PassPaintMessages();

    ::GetCursorPos( &m_ptTrackInvoked );
    m_ptTrackWatched = m_ptTrackInvoked;

    if( _IsTopLevelPopup() )

The popup is deleted between the first and the last rows of the piece, because first ASSERT passes and the one inside _IsTopLevelPopup() fails.

CExtResizableDialog::OnInitDialog() causes the deletion, but it seems sometimes it happens at a bad time and leads to a crash. The dialogs are created in application’s main thread.



Is there a way to avoid such crashes?

This was answered in a separate email.

TSELLC_Support