I have an MDI application and it seems that when i drop down a control and then move the form, the drop down disconnects from the control. Please see attached image. I tried refreshing/repainting the form on move to no avail. Is there a work-around for this, or has this even been seen? any help is greatly appreciated. ADDED: i have been doing some testing and found that this is a side effect of the custom ShowDialog method i am using. I am basically doing a show and then waiting in a message loop for the user to close the form: base.Show(); MSG msg = new MSG(); while (GetMessage(out msg, IntPtr.Zero, 0, 0) && !_closed) { TranslateMessage(ref msg); DispatchMessage(ref msg); } return this.DialogResult; I still have to find a way around this. Not sure if anyone has any insight.