Deleting owner window of popup menu when popup menu is displayed

I am using TrackPopupMenu to display a popup menu. When "inside" TrackPopupMenu, a timer is running (remember that a TrackPopupMenu has an internal message loop). The WM_TIMER event will cause me to destroy the window that I sent as owner window to TrackPopUpMenu. This will also cause a DestroyMenu of the popped up menu.
Amazingly, Windows will not hide the menu and if I click on a menuitem my application will crash.
How can I hide the menu before destroying it and thus overcome Win32's bug? I have heard of an undocumented "EndMenu" Win32 function but a look at User32.dll of win95 does not show me that function (NT's user32.dll does).
giltayarAsked:
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galkinCommented:
Send WM_CANCELMODE message to menu owner window before thos window is actually destroyed.
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