def _process_box_select(self, event):
        event.Skip()
        self.unhighlight_days(self._box_select)

        if not event.Leaving():
            self.add_days_to_selection(self._box_select)
            self.selected_list_changed()

        self._box_select = []
Return a copy of a DataFrame excluding elements from groups that
dataset/ETHPy150Open enthought/traitsui/traitsui/wx/date_editor.py/MultiCalendarCtrl._process_box_select--crossover with--dataset/ETHPy150Open pydata/pandas/pandas/core/groupby.py/NDFrameGroupBy.filter