I have marker controls on my map and I have an eventtrigger on my marker control that listens for a mouseclick. I then expand the wpf user control to display some details, similar to how a popup would work. However, when the control is expanded over another marker, the "covered" marker has a higher z order and remains visible. Is there any way to promote the canvas of one marker control over other markers? Attached is a screen shot of the problem I am seeing.