Usage in Lua

You can use it in lua
All you need is to add "require "CUITypes" to your script
This the file will be generated by CUI before your script is executed

Same example in lua

require "CUITypes"

local frame = CUIFrame()
frame.Relative = CUINullRect(nil, nil, 0.2, 0.2)
frame.Anchor = CUIAnchor.Center

frame["guh button"] = CUIButton("Press me")
frame["guh button"].Anchor = CUIAnchor.Center
frame["guh button"].AddOnMouseDown = function(e) print('guh') end

CUI.Main.Append(frame)