How to use the comiccrawler.gui.core.safe_tk function in comiccrawler

def handle_click(event):
			if event.state & 0x0001 and self.anchor_index is not None: # shift
				start = min(self.anchor_index, index)
				end = max(self.anchor_index, index)
				for i in range(start, end + 1):
					if i in (index, self.anchor_index):
						continue
					check = self.checks[i]
					if check.instate(("selected", )):
						check.state(("!selected", ))
					else:
						check.state(("selected", ))
			else:
				self.anchor_index = index
				
		check = ttk.Checkbutton(self.window, text=safe_tk(ep.title))
		check.bind("", handle_click)
		check.state(("!alternate",))
		if not ep.skip:
			check.state(("selected",))
		check.grid(
			column=(index // 20) - self.window_column,
			row=index % 20,
			sticky="w"
		)
		self.checks.append(check)

def update_table(self, pool):
		"""Refresh treeview."""
		table = self.pool_index[id(pool)]
		missions = pool.values()
		
		table.clear(exclude=missions)
		
		for mission in missions:
			if not table.contains(mission):
				table.add({
					"name": safe_tk(mission.title),
					"host": mission.module.name,
					"state": STATE[mission.state],
					"last_update": draw_last_update(mission.last_update)
				}, key=mission)
				
		table.rearrange(missions)

def __init__(self, parent, title="Dialog", on_closed=None):
		self.parent = parent
		self.result = None
		self.on_closed = on_closed
	
		# root
		self.root = tk.Toplevel(parent)
		self.root.title(safe_tk(title))
		
		# body
		self.body = ttk.Frame(self.root)
		self.create_body()
		self.body.pack()
		
		# button bar
		self.btn_bar = ttk.Frame(self.root)
		self.create_buttons()
		self.btn_bar.pack()
		
		# bind event
		self.root.bind("", self.resolve)
		self.root.bind("", self.reject)
		
		# show dialog and disable parent

def create_body(self):
			entry = ttk.Entry(self.body)
			entry.insert(0, safe_tk(mission.title))
			entry.selection_range(0, "end")
			entry.pack()
			entry.focus_set()
			self.entry = entry

def update_mission_info(self, table, mission):
		"""Update mission info on treeview."""
		if not table.contains(mission):
			return
		table.update(
			mission,
			name=safe_tk(mission.title),
			state=STATE[mission.state],
			last_update=draw_last_update(mission.last_update)
		)