problem on MFC MDI program with Direct2D wrapper

[GiuPa]

I'm programming a program in MFC MDI using the Direct2D wrapper and I have a problem when I open two windows and one I drag it over the other that the color of the window is dirty the edges of the active window.

I can not figure out where the problem comes from !

Example application running on Windows 7 x64



some idea ?

Thanks!

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