Type Coercion failed

while testing my application I decided to make some simple movie clips and load them instead of images i was using… I made a button that has animation on roll over. it loads as it should, and all is working fine - animations, effects etc. but when I move mouse over it im getting Type Coercion error… the thing is I’m not even listening to that object’s actions. I’m not getting any debugging errors in Flex, only IE browser is reporting those errors. FF also, I just checked… Exact error msg is:

TypeError: Error #1034: Type Coercion failed: cannot convert flash.events::Event@6c80a61 to classes.common.util.CustomEvent.

ok, I understand what’s going on and why I’m getting it, but I dont have a clue how to find it (: This stupid lil’ button I made is dispatching some event and somewhere in my application something is getting that event and trying to use it as event from my CustomEvent class. But I’ve removed all listeners (comment 1st than I actually deleted them)… I don’t have any listeners on stage, stage.layout, stage.layout.navigation or on buttons. so what’s causing that error?

I’m attaching the sfw of a button, didn’t even bother to save .fla. It has no action script, just plain graphics and movieclip. I didn’t name any symbol instances…