-        wxComboBox(self, 501, "default value", wxPoint(80, 80), wxSize(95, -1),
-                        sampleList, wxCB_SIMPLE)
+        cb = wxComboBox(self, 501, "default value", wxPoint(80, 80), wxSize(95, -1),
+                        [], wxCB_SIMPLE)
+        for item in sampleList:
+            cb.Append(item, string.upper(item))