Hi Peter,
What your looking for isn't possible in a Windows Store app. As you note (and as documented) RenderTargetBitmap relies on the tender thread and can only render elements in the foreground visual tree.
It is not possible to use it in the background or to prevent the app from suspending if the user switches away.
There are no other API to render UI elements, but some folks have emulated this by parsing the visual ye and rendering the elements themselves with Direct2d
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