How to make the text in textbox can undo?

I need this for my plugin, here is the script I use:

local box = gui.TextBox
local HistoryService = game:GetService("ChangeHistoryService")
box:GetPropertyChangedSignal("Text"):Connect(function()
	print("Changed")
	HistoryService:SetWaypoint("Text changed")
end)

It undo the focus not text! Help please