Transparent Windows Forms in Windows Embedded Compact 7

Question

I am looking for a solution to make the background of a Windows Forms in a Windows Embedded Compact 7 device transparent. These approaches have failed:
- override void OnPaintBackground with empty code block
- using the open source project AlphaMobileControls

Answer 1

Sorry, I thought that article had more detail.  Now I look at it again it's rather less useful than I thought.
bitblt is copying pixels.
https://msdn.microsoft.com/en-us/library/aa452879.aspx
The way this would have to work ( afaik ) is you copy some proportion of the bits out the rectangle behind your window.
If you want low opacity rather than completely transparent you would merge them with whatever colour you want the background to look a bit like.
You'd be painting a picture onto the background in the onpaint.
If your user moves the "transparent" window then you need to copy the background from the new location.
If it were me I'd push back on the requirement.
Hope that helps.
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Dynamic XAML