<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def draw_markers(self):
 """Draw all created markers on the TimeLine Canvas"""

        self._canvas_markers.clear()
        for marker in self._markers.values():
            self.create_marker(marker["category"], marker["start"], marker["finish"], marker)