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How to get CB_SHOWDROPDOWN message?

Posted on 1998-10-16
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Last Modified: 2013-11-20
Hi,

I wrote a activex control that use "COMBOBOX" as classname, that is , I want
it to behave like a combobox. I want to show my own window when the user click
the button of it, but I can not get the CB_SHOWDROPDOWN message, who can help
me?

Thanks in advance.
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Question by:wuxz
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CB_SHOWDROPDOWN message is not sent to you: you send it to the control to tell it to drop down.

Look for CBN_DROPDOWN message if you want to know when the combo is about to be dropped by the user.

It is sent to the parent of the control by Windows as a WM_COMMAND message with CBN_DROPDOWN message.

MFC reflects it to the control.  Look for "=CBN_DROPDOWN" in the messages part of the class wizard
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