In Aw.combo v2.5

Hi, i want to handle something in event of clicking in the combo.so i want to know which event has been raised at the time of clicking combo(on the time of popup displayed). please help me to get out this problem

Look in /source/lib/templates/combo.js, line 31

Hi Alex, i am new in the site. so i am not able to find /source/lib/templates/combo.js. Please get me where i can find this combo.js