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Message: [QUOTE="Norman Bullen, post: 9646405"] The CS_SAVEBITS was on the window that the ComboBox uses to display its drop-down list. When I started reconstructing my project to get a minimal set of code, I found that it exhibited a problem similar to that which you described before I got to the point of adding any ComboBoxes. So, yes, it is a different problem but probably related; I'm fairly sure the Tab control has something to do with both. Removing WS_CLIPCHILDREN from this small program made it function correctly but does not solve the painting problems in my complete program. I'm still trying to get a minimal program to show the problem. I create and destroy the child dialogs because the program is meant to be ported to Windows CE as well as "big" Windows and I want to minimize the system resources that it uses. Norm [/QUOTE]