Transparency on candle lamp

Hi, i converted a candle lamp from the sims 2 to 4. I followed the tutorial in order to add flame fx (http://sims4studio.com/thread/3463/make-candle-multiple-flames). But i'm having problem with trasparency. The first lamp (to the left) is a cloned version of the dine out lamp; but trasparency doesn't work despite i tried to add glasstranslucent shader (http://sims4studio.com/thread/1157/objects-glass-balloon-effect) and added alpha channel. The second lamp (to the right) is a clone of the oil lamp (base game). As you can see the flame isn't visible throught the glass. Why?
The texture's alpha cannel is ok.