WPF transparent borders causes the UI to stop redrawing?

Are you using . NET 3.0, or . NET 3.5 on Windows XP SP2?

If so, this is a known problem with the transparent window API that has been fixed in . NET 3.5 and SP3 of XP (and I think SP1 of Vista). Basically when you set the AllowsTransparency to True, the WPF pipeline has to render in software only mode.

This will cause a significant degradation in performance on most systems.

I think that I've finally found a workaround. From everything I've read this problem should not be occurring with XP SP3 & . NET 3.5 SP1, but it is.

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