How to remove gray background on MDI parent form?
问题 What I'm trying to do is draw some glass on a form marked as an mdi container. However as soon as the IsMdiContainer is set, the form adds an MdiClient to it's list of Controls. At this point something happens to the parent form - almost like a dark gray panel is being docked to the entire form onto which the MdiClient is being placed on. I then do is the following to move the MdiClient control out of the way a bit: foreach(var c in Controls) { if(c is MdiClient) { var client = (MdiClient)c;