Win7 refresh problem when resizing custom MFC controls

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Windows

MFC

Win7

Hi All

I'm writing a program that has custom graphic controls (just like task manager's graphs) which I coded myself. I'm usually running the program on WinXP and everything is fine.

I tested it on Win7 and I saw a nasty refresh problem. Virtually the controls are reduced to white rectangles while resizing. The rectangles are resized as it should but nothing but white can be seen inside them, and they stay like this after I finish resizing.

These controls are refreshed each second so after I finish resizing their content is shown within a second but without the sunken client edge which makes them look ugly. And Also none of the standard controls has this problem. only my custom ones.

I set these controls by placing a static text control in the dialog resource (with border property set) and then I set their control variable to be of my CWnd heired class that does the drawing at OnPaint (standard stuff I say this just for cleanness).

At first I figured it was because of pDC->ExcludeClipRect(&CtrlRect); I call at OnEraseBkgnd. It has wonderful anti-flicker effect in WinXP. So I made a build of my program having all that code in all OnEraseBkgnd funcs deleted (set as comments) so those function calls have their default behaviour.
- Absolutely no effect - it was just the same. So obviously that's not the problem.

I set a RedrawWindow call at OnSize which fixes the issue but that's very performance ineffective and the flicker is awful.

So does somebody encountered this problem? It'd be great if something can be done. I've googled this and all I found was that 2 years ago someone had very similar problem and he addressed it directly to MS support and they've said they'll look into it. :)

Thanks in advance! :)

P.S. If any additional info is needed please don't hesitate to ask me for it.