Web browser element in a plugin based on ActiveElementsOverlay sample (Smart Client)

In ActiveElementsOverlay sample plugin there is a button and rectangle.

Is there a way I can have a web browser element there too? And if yes, could this web browser be semi-transparent so it will not cover video stream (same as button in this example)? Or it may be semi transparent when inactive and transparency can be switched off on mouse hover.

If you can find a web browser control that is deriving from the ActiveElement WPF class then the answer is yes, but whether such control exist we don’t know.