Custom button in title bar (MDI)

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#4216

From: Thorsten Kettner
Date: Tue, 07 Mar 2006 15:29

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Hi, I am trying to place a custom button in the window's title 
bar. I am catching WM_NCPAINT to do this. This works fine. On 
WM_NCACTIVATE and WM_SETTEXT Windows would paint my button over 
and not send WM_NCPAINT. I avoid this by catching these too and
suppress their drawing and do mine instead. This works fine too.

My problem: My form is an MDI sheet. When I maximize it, my 
button gets painted over. There must be another event just like
WM_NCACTIVATE and WM_SETTEXT that does this. I just don't know
which one. Who knows? Which message must I catch and treat like
I do with WM_NCACTIVATE and WM_SETTEXT?

TIA.

PS: If anybody should look for a code sample on how to draw a
custom button in the title bar, I got my information here:

  http://www.catch22.net/tuts/titlebar.asp

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