Does anyone know how to get the mouse in a plugin?

I'm trying to find the mouse of the player inside a plugin Does anyone know how to get the mouse of a person who pressed a plugin?

local plugin = PluginManager():CreatePlugin()
local toolbar = plugin:CreateToolbar("test")
local button = toolbar:CreateButton("test", "test", "test.png")

button.Click:connect(function()
	mouse = GetMouse()
	mouse.Button1Down:connect(function()  --This isn't working 
		print("Button 1 pressed from PluginMouse")
	end)
end)