public void EndUpdate()
 {
     NativeMethodsProxy.SendMessage(this.Handle, NativeMethodsProxy.WM_SETREDRAW, new IntPtr(1), IntPtr.Zero);
     Parent.Invalidate(true);
 }
 public void BeginUpdate()
 {
     NativeMethodsProxy.SendMessage(this.Handle, NativeMethodsProxy.WM_SETREDRAW, IntPtr.Zero, IntPtr.Zero);
 }