+        old = event.GetOldSelection()
+        new = event.GetSelection()
+        self.log.write('OnPageChanged, old:%d, new:%d\n' % (old, new))
+        event.Skip()
+
+    def OnPageChanging(self, event):
+        old = event.GetOldSelection()
+        new = event.GetSelection()
+        self.log.write('OnPageChanging, old:%d, new:%d\n' % (old, new))