Add some refreshes to try and workaround a display glitch

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28078 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/demo/PopupWindow.py

@@ -48,7 +48,10 @@ class TestPopup(wx.PopupWindow):
         st.Bind(wx.EVT_LEFT_UP, self.OnMouseLeftUp)
         st.Bind(wx.EVT_RIGHT_UP, self.OnRightUp)
 
+        wx.CallAfter(self.Refresh)
+
     def OnMouseLeftDown(self, evt):
+        self.Refresh()
         self.ldPos = evt.GetEventObject().ClientToScreen(evt.GetPosition())
         self.wPos = self.ClientToScreen((0,0))
         self.CaptureMouse()