protected virtual void SetVisibleCore(bool value) {
			if (value != is_visible) {
				is_visible = value;
				
				if (is_visible && ((window.Handle == IntPtr.Zero) || !is_created))
					CreateControl ();

				if (IsHandleCreated) {
					XplatUI.SetVisible (Handle, is_visible, true);
					
					if (is_visible && this is Form) {
						// If we are Min or Max, we won't get a WM_SHOWWINDOW from SetWindowState,
						// so we need to manually create our children, and set them visible
						// (This normally happens in WmShowWindow.)
						if ((this as Form).WindowState != FormWindowState.Normal)
							OnVisibleChanged (EventArgs.Empty);
						else
							XplatUI.SetWindowPos(window.Handle, bounds.X, bounds.Y, bounds.Width, bounds.Height);	
					}
				}
				else {
					OnVisibleChanged(EventArgs.Empty);
				}
			}
		}