How to keep the arrow button down in CToolBar?

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From: Bill Gates (billgates_at_microsoft.com)
Date: 08/10/04 

Date: Tue, 10 Aug 2004 11:11:35 +0800

In my program, I created a CToolBar control. And there is a button with
TBSTYLE_DROPDOWN style in the CToolbar control. I use its arrow button
to show a undo history window(modeless). I wanna keep the arrow button
down when showing the undo history window like popup a menu.

How to do it?

Thanks!

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