self._mainWindow.connect("key-press-event", self._on_key_press)
self._mainWindow.connect("window-state-event", self._on_window_state_change)
self._categorySelectionButton.connect("clicked", self._on_category_selector_clicked)
self._mainWindow.connect("key-press-event", self._on_key_press)
self._mainWindow.connect("window-state-event", self._on_window_state_change)
self._categorySelectionButton.connect("clicked", self._on_category_selector_clicked)