fix error when opening the progress dialog when running all the unit tests

Author: LilyTronics

tests/unit_tests/test_gui/test_view_progress_dialog.py

@@ -36,7 +36,7 @@ def _test_thread(test_function):
         app = self.gui.get_wx_app()
         test_frame = self.TestFrame()
         test_frame.Show()
-        ProgressDialog(test_frame, self._TITLE, 10)
+        wx.CallAfter(ProgressDialog, test_frame, self._TITLE, 10)
         t = self.start_thread(_test_thread, (test_function_to_run,))
         app.MainLoop()
         self.wait_for(t.is_alive, False, self._thread_time_out, 0.1)