Just wanted to say that I just implemented this and its much easier then I thought, and it works just fine.I think the way to go is to disable the title bar, and grab the mouse in the part of the dialog designated for the custom title bar, use normal buttons to do the sysbutton stuff.
Easy said, don't know how easy it is to implement...
I will make a designer plugin out of it so I can use it in future such projects.
Just so you'll know this method works ok.
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