code: def OnApprove(self, event):
          
  
          if not self.main_window.safe_mode:
              return
  
          msg = _(u"You are going to approve and trust a file that\n"
                  u"you have not created yourself.\n"
                  u"After proceeding, the file is executed.\n \n"
                  u"It may harm your system as any program can.\n"
                  u"Please check all cells thoroughly before\nproceeding.\n \n"
                  u"Proceed and sign this file as trusted?")
  
          short_msg = _("Security warning")
  
          if self.main_window.interfaces.get_warning_choice(msg, short_msg):
              # Leave safe mode
              self.main_window.grid.actions.leave_safe_mode()
  
              # Display safe mode end in status bar
  
              statustext = _("Safe mode deactivated.")
              post_command_event(self.main_window, self.main_window.StatusBarMsg,
                                 text=statustext)
docs: File approve event handler