Hi Chris,

It appears that the ChildWindow's overlay inadvertantly overlapped the UXDock control, because it did not know the existence of certain visual that it shouldn't overlap. I would not say this is a known issue of the dock, but simply the design and built-in behavior of the ChildWindow itself.

ClientUI brings a more advanced windowing concept, where dialog box and window can be integrated to the desktop, as well as to the dock. This enables a dialog box, or a window, to become aware of the existence of the task bar in the page, and provides a special treatment for that. For more information, you can read my blog post here.

The windowing and desktop controls are available for you to use if you already reference the ClientUI assemblies in your project. Let me know if you have any questions.

Hope this helps,
Jimmy