code: def setup_buttons(self):
          
          self.fromcursor_btn = create_toolbutton(
              self, icon=ima.icon('fromcursor'), tip=_('Go to cursor position'),
              triggered=self.treewidget.go_to_cursor_position)
  
          buttons = [self.fromcursor_btn]
          for action in [self.treewidget.collapse_all_action,
                         self.treewidget.expand_all_action,
                         self.treewidget.restore_action,
                         self.treewidget.collapse_selection_action,
                         self.treewidget.expand_selection_action]:
              buttons.append(create_toolbutton(self))
              buttons[-1].setDefaultAction(action)
          return buttons
docs: Setup the buttons of the outline explorer widget toolbar.