<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def OnLabelSizeIntCtrl(self, event):
 """Label size IntCtrl event handler"""


        self.attrs["labelsize"] = event.GetValue()

        post_command_event(self, self.DrawChartMsg)