-        wxBitmapButton(self, 30, bmp, wxPoint(140, 20),
-                       wxSize(bmp.GetWidth()+10, bmp.GetHeight()+10))
-        EVT_BUTTON(self, 30, self.OnClick)
+            #wx.GetApp().SetAssertMode(wx.PYAPP_ASSERT_SUPPRESS)
+            #wx.GetApp().SetAssertMode(wx.PYAPP_ASSERT_EXCEPTION)
+            #wx.GetApp().SetAssertMode(wx.PYAPP_ASSERT_DIALOG)
+            #wx.GetApp().SetAssertMode(wx.PYAPP_ASSERT_EXCEPTION | wx.PYAPP_ASSERT_DIALOG)
+
+            try:
+                bmp = wx.Bitmap("nosuchfile.bmp", wx.BITMAP_TYPE_BMP)
+                mask = wx.MaskColour(bmp, wx.BLUE)
+            except wx.PyAssertionError:
+                self.log.write("Caught wx.PyAssertionError!  I will fix the problem.\n")
+                bmp = images.getTest2Bitmap()
+                mask = wx.MaskColour(bmp, wx.BLUE)
+        else:
+            bmp = images.getTest2Bitmap()
+            mask = wx.MaskColour(bmp, wx.BLUE)
+
+        bmp.SetMask(mask)
+        wx.BitmapButton(self, 30, bmp, (160, 20),
+                       (bmp.GetWidth()+10, bmp.GetHeight()+10))
+        self.Bind(wx.EVT_BUTTON, self.OnClick, id=30)