Parent Canvas mouse button effecting on Child Canvas

Question

Hi, I am developing one silverlight application in that I placed one main canvas(LayoutRoot) and there are 6 child canvas are there with videos.I have written mouse events for main canvas and child canvas seperately.Purpose when I drag and drop main canvas it will drag entire canvas with child canvas and if I drag one of the child canvas it shouldn't drag main canvas too only drag one that particular canvas.I am facing problem that if I drag main canvas its working good and if I try to drag one of those child canvas it is dragging main canvas also.Can you please anybody help me how to stop main canvas mouse button events wont effect on child canvas. Thanks in Advance Pavani