<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def delete(self, *items):
 """ Delete all specified items and all their descendants. The root item may not be deleted. :param items: list of item identifiers :type items: sequence[str] """

        self._visual_drag.delete(*items)
        ttk.Treeview.delete(self, *items)