How to catch vbMsgBoxHelpButton in the Message Box

[chem1]

Hello there,
can anyone tell me how can I catch the Help Button on a message box.MSDN says MsgBox does not return this value,
Thankx in advance.....

[Lothar Haensler]

from the docs for MEssagebox API:
". When the user clicks the Help button or presses F1, the system sends a WM_HELP message to the owner."
Thus, you have to subclass the owner window and trap the WM_HELP message.