How to update sprite pixel in runtime

[Justion_Ko]

I need to update the sprite pixel at runtime . Without NGUI, I can create a texture2D object ,and update its pixel data ,then assign it to a GUITexture.
Now i want the all UI stuffs to be done with NGUI, How can i do with it?

[ArenMook]

You should not be modifying atlas textures.

Feel free to modify the Texture2D exactly as you did before with GUITexture. Except this time you'll be using a UITexture to display them.