# A very strange problem: MouseEvent

**URL:** <https://forum.kirupa.com/t/a-very-strange-problem-mouseevent/270804>\
**Category:** flash\
**Created:** [September 14, 2008, 5:09pm UTC](https://forum.kirupa.com/t/a-very-strange-problem-mouseevent/270804 "2008-09-14T17:09:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zhangxiaorui](https://avatars.discourse-cdn.com/v4/letter/z/e495f1/32.png) [@zhangxiaorui](https://forum.kirupa.com/u/zhangxiaorui)\
**Post date:** [September 14, 2008, 5:09pm UTC](https://forum.kirupa.com/t/a-very-strange-problem-mouseevent/270804/1 "2008-09-14T17:09:29Z")

</div>

there is a moveclip a\_mc and it contains a button: a\_mc.b\_btn

When using a\_mc.b\_btn.addEventListener(MouseEvent.CLICK, handler) i got nothing when the button is clicked, but if I use

a\_mc.addEventListener(MouseEvent.CLICK, handler)

And the target in the handler is b\_btn

Any one tell me why I cannot just listen to the event with the button!?