Thank you for the screenshot.
This is the default behaviour of the Pane, it does not stay on top of elements outside the Docking control. To overcome this I can suggest you to put the custom UserControl also in the Docking control in a separate SplitContainer and set the following Pane's properties:
Also, to remove the Compass you could refer to the following help article
and for a sample project to this blog post
Hope this information helps. If you have any other questions please let us know.
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