WPF: unable to resize window without horrible visual effects

I am trying to learn WPF (I worked a lot with WinForms, but I am new to WPF) and I have a problem when resizing windows. There are terrible visual effects.

Here's what was expected:   http://data.imagup.com/12/1130871175.jpg

Here is what I get: http://data.imagup.com/12/1130871187.jpg or http://data.imagup.com/11/1130871194.jpg

I do nothing, even an empty window does not display correctly when resizing! I have no problem when the window is maximized. What is the problem?

Windows 7 32-bit / .Net 3.5 / Raden HD5850

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2 WPF, - Catalyst.

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