Dynamically create a button

[AllanZinyi]

I'm new in both NGUI and unity.
I do not know how to apply Atlas and Sprite on the button I have created dynamically.
By the way, I'm using c#.

[ArenMook]

A button can be anything with a collider. Assuming you are talking about one of NGUI's stock controls, a button there is a UISprite for the background and a UILabel for the text. To get one of them, you can simply use GetComponent / GetComponentInChildren like any other script.