Unity 4.6 2D,UI apears under game Sprite

Hi guys! I wanted to make a Pause Menu for my game and my Sprites appear on top of the interface and this is pretty anoying because I don't know how to make the UI on top of the gameobjects. The interface is corectly placed in the UI layer and the gameobjects are in the default layer. I have also tryed to adjust the Z on the UI objects but this did nothing. Any help is apreciated.Please help me.Thank you!