def METHOD_NAME(self):
    """called when the QNodeElementEdit is activated"""
    win_parent = self.win_parent
    if win_parent is None:
        return
    gui = win_parent.win_parent
    if gui is None:
        return
    self._is_updated = False
    if self.pick_style == 'area':
        style = gui.mouse_actions.on_area_pick(
            is_eids=self.is_eids, is_nids=self.is_nids,
            representation=self.representation,
            name=self.name,
            callback=self.on_focus_callback,
            cleanup=self.cleanup,
            force=True)
    elif self.pick_style == 'single':
        style = gui.mouse_actions.on_highlight(
            is_eids=self.is_eids, is_nids=self.is_nids,
            representation=self.representation,
            name=self.name,
            callback=self.on_focus_callback,
            cleanup=self.cleanup,
            force=True)
    else:
        raise NotImplementedError('pick_style=%r and must be [area, single]' % self.pick_style)
    # if style has updated the gui
    if self._is_updated and 0:
        if self.style is not None:
            self.style.remove_actors()
            gui.vtk_interactor.Render()
    #self.style = style