public void OnDragging(ViewControl vc, Point scrPt) { try { _nativeManip.OnDragging(vc as GUILayer.IViewContext, scrPt); } catch (Exception e) { // we want to report this error as a hover message above "srcPt" in the view control Point msgPt = scrPt; msgPt.X += 20; msgPt.Y -= 20; vc.ShowHoverMessage(e.Message, msgPt); } }