Capture moue movements on a WPF window drawn behind icons and dispose the handler on exit

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I have a WPF window which I managed to draw behind desktop icons using the tutorial from here: Codeproject link.

Now I need two things.

First, because of the window position it doesn't capture any moue events which is good for my project. But I only need to make the window capture mouse movements, nothing else. In the tutorial I used it says to use WH_MOUSE_LL event. Please if anyone can show any light on this subject.

Secondly, after the window close event there is a static image of the window still showing on the background. May be this is because of the WorkerW handle which I produced through the previous code still there. How to dispose that in Window_closing event?

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