Hide or prevent the use of the popup menu on the title bar

Hi guys, does someone know how to hide or prevent the use of the popup menu that come up when the user click a dialog title icon?

I am searching for a way to do that, for better understanding my problem I made a screenshot, here's the menu I am trying to hide/disable:

http://img104.imageshack.us/img104/7152/menuho4.jpg

Please someone can help me?

You have to change the dialog styles. I get confused with all those, but I am guessing you have to remove the WS_CAPTION and the WS_SYSMENU styles. Btu anyway, that's the hint