You may try put an as3 function that works after 2,3 sec:
setTimeout(timedFunction,2300);
function timedFunction() { function here }
Then you may try putting a label inside the movieclip yellowBar2_mc on the first frame of your movie clip called "fr1":
setTimeout(timedFunction,2300);
function timedFunction() { yellowBar2_mc.gotoAndPlay("fr1"); }
You can start the movieclip animation with:
yellowBar2_mc.gotoAndPlay("fr1");