Unity3d: NGUI + A* pathfinding

Hi all! I make a 2d game with Unity3d and NGUI, and I need to find path avoiding obstacles. I used A* pathfinding algorithm for 3d objects on plane and it’s working fine. But when I tried to use it for NGUI plane there was some problems…
First of all, I need to change layers for plane and obstacle objects for pathfinder. But if I do it, NGUI camera doesn’t render them in game, only objects with default layer.
Help me, please! Any tips would be helpful.

You can tell the NGUI camera which layers to render. Just change that.