X11 Error encountered:
  Error: RenderBadPicture (invalid Picture parameter)
  Request:     150 (150)
  Resource ID: 0x4E05BA4
  Serial:      86239
  Hwnd:        <null>
  Control:     <null>
   at System.Windows.Forms.XplatUIX11.HandleError ()
   at System.Windows.Forms.XplatUIX11.HandleError ()
   at System.Windows.Forms.XplatUIX11.XGetWindowProperty ()
   at System.Windows.Forms.XplatUIX11.XGetWindowProperty ()
   at System.Windows.Forms.XplatUIX11.UpdateWindowState ()
   at System.Windows.Forms.XplatUIX11.GetWindowState ()
   at System.Windows.Forms.XplatUIX11.SetWMStyles ()
   at System.Windows.Forms.XplatUIX11.CreateWindow ()
   at System.Windows.Forms.XplatUI.CreateWindow ()
   at System.Windows.Forms.NativeWindow.CreateHandle ()
   at System.Windows.Forms.Control.CreateHandle ()
   at System.Windows.Forms.Control.CreateControl ()
   at System.Windows.Forms.Control.ChangeParent ()
   at System.Windows.Forms.Control+ControlCollection.AddImplicit ()
   at System.Windows.Forms.MdiClient.SizeScrollBars ()
   at System.Windows.Forms.MdiWindowManager.FormLocationChangedHandler ()
   at System.MulticastDelegate.invoke_void_object_EventArgs ()
   at System.Windows.Forms.Control.OnLocationChanged ()
   at System.Windows.Forms.Form.OnCreateControl ()
   at System.Windows.Forms.Control.CreateControl ()
   at System.Windows.Forms.Control.WmShowWindow ()
   at System.Windows.Forms.Control.WndProc ()
   at System.Windows.Forms.ScrollableControl.WndProc ()
   at System.Windows.Forms.ContainerControl.WndProc ()
   at System.Windows.Forms.Form.WndProc ()
   at System.Windows.Forms.Control+ControlWindowTarget.OnMessage ()
   at System.Windows.Forms.Control+ControlNativeWindow.WndProc ()
   at System.Windows.Forms.NativeWindow.WndProc ()
   at System.Windows.Forms.XplatUIX11.SendMessage ()
   at System.Windows.Forms.XplatUIX11.MapWindow ()
   at System.Windows.Forms.XplatUIX11.CreateWindow ()
   at System.Windows.Forms.XplatUI.CreateWindow ()
   at System.Windows.Forms.NativeWindow.CreateHandle ()
   at System.Windows.Forms.Control.CreateHandle ()
   at System.Windows.Forms.Form.CreateHandle ()
   at System.Windows.Forms.Control.CreateControl ()
   at System.Windows.Forms.Control.SetVisibleCore ()
   at System.Windows.Forms.Form.SetVisibleCore ()
   at System.Windows.Forms.Control.set_Visible ()
   at System.Windows.Forms.Control.Show ()
   at MDIThingy.MainFormTest.addChild ()
   at MDIThingy.MainFormTest.newWindow ()
   at MDIThingy.MainFormTest.toolBar1_ButtonClick ()
   at System.MulticastDelegate.invoke_void_object_ToolBarButtonClickEventArgs ()
   at System.Windows.Forms.ToolBar.OnButtonClick ()
   at System.Windows.Forms.ToolBar.ToolBar_MouseUp ()
   at System.MulticastDelegate.invoke_void_object_MouseEventArgs ()
   at System.Windows.Forms.Control.OnMouseUp ()
   at System.Windows.Forms.Control.WmLButtonUp ()
   at System.Windows.Forms.Control.WndProc ()
   at System.Windows.Forms.ToolBar.WndProc ()
   at System.Windows.Forms.Control+ControlWindowTarget.OnMessage ()
   at System.Windows.Forms.Control+ControlNativeWindow.WndProc ()
   at System.Windows.Forms.NativeWindow.WndProc ()
   at System.Windows.Forms.XplatUIX11.DispatchMessage ()
   at System.Windows.Forms.XplatUI.DispatchMessage ()
   at System.Windows.Forms.Application.RunLoop ()
   at System.Windows.Forms.Application.Run ()
   at MDIThingy.Form1.Main ()