Thank for your kind reply, Khazzack and Nicki.
Actually, I investigated all example scenes on NGUI plugin.
In fact, in game development, the best way is to know the strong sample rather than all branches of ways.
I think so.
I think, NGUI team is creating awesome projects beside their plugin.
So, I'm really hoped to be helped from them regarding their completed projects.
Only NGUI part is needed, not game play, or NGUI plugin's source code (because I have paid version).
What is boils down, is that I want to know how to build a house , rather than what is needed to build a house.
Thanks again.