Thanks for your suggestion.
Now I'm developing Angry Bird like 3D quoits game.
The Quoit is 3D object, but Items to catch it are Uni2D sprite which has 3D collider that is featured function of Uni2D.
This game worked well before creating NGUI parts.
First, When I drag and dropped any texture into Scene Window, Uni2D force make sprite.
Uni2D automatically create related resouces and attempt manage and control it all over in Unity.
So, I cannot use native Unity 2D sprites.
Secondary, When I drag and dropped NGUI Button prefab into Scene Window, pre-existing Uni2D sprite
become larger about double and it seems to be moved a little bit right-upper, only in the Game Window.
The sprite in Scene Window seems to be the same as before.
And then, I couldn't recover the size and position. NGUI button works well, though.
According to YouTube video, he uses NGUI script for interaction.
Looking other games using Uni2D, Their User Interface works well and very complex.
What I need to do is only building rich User Interface, regardless of kind of plugin or assets.
