TrackPopupMenu and default taskbar menu

[ahmd]

Hi everyone:

I'm not sure why this happens, so maybe someone can clear this up for me.

Say, I want to display a pop-up menu from my program's tray icon on the task bar. I do the following:

		int nRes = TrackPopupMenu(hMenu, TPM_RIGHTALIGN | TPM_TOPALIGN |
			TPM_LEFTBUTTON | TPM_VERPOSANIMATION | TPM_HORNEGANIMATION | TPM_RETURNCMD,
			pnt.x, pnt.y, 0, hMainWnd, NULL);

Because of some bug in the Explorer shell the menu isn't dismissed when someone clicks outside of it, so I had to add the following code to accommodate for that (which can be found throughout Win32 forums online):

		::SetForegroundWindow(hMainWnd);

		int nRes = TrackPopupMenu(hMenu, TPM_RIGHTALIGN | TPM_TOPALIGN |
			TPM_LEFTBUTTON | TPM_VERPOSANIMATION | TPM_HORNEGANIMATION | TPM_RETURNCMD,
			pnt.x, pnt.y, 0, hMainWnd, NULL);

		PostMessage(WM_NULL, 0, 0);

That takes away that bug, but what happens is that at times when my tray icon is first displayed on the task bar's tray and I try to right-click it, I get my pop-up menu and also get the default task bar menu (picture below) displayed over it, as if I right-clicked the task bar itself. This happens only the first time I right-click my tray icon.

Can someone tell me why this happens and how to remedy that?


PS. I'm running these tests on a Windows 7 with a default theme (and glass effect enabled).