def treeview_clicked(self, widget, event):
"""Responds to right click events on the TreeView."""
if event.button == 3:
store, course_iter = widget.get_selection().get_selected()
course_id = store.get(course_iter, 4)[0]
self.selected_id = course_id
self.selected_course = self.course_manager.courses[course_id]
self.edit_menu.popup(None, None, None, None, event.button, event.time)
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