# Setting alpha problem

**URL:** https://forum.kirupa.com/t/setting-alpha-problem/308696
**Category:** Uncategorized
**Created:** [April 28, 2010, 11:37am UTC](https://forum.kirupa.com/t/setting-alpha-problem/308696 "2010-04-28T11:37:15Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![magapatalogikaa](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/magapatalogikaa/32/3185_2.png) [@magapatalogikaa](https://forum.kirupa.com/u/magapatalogikaa)
#### Post date: [April 28, 2010, 11:37am UTC](https://forum.kirupa.com/t/setting-alpha-problem/308696/1 "2010-04-28T11:37:15Z")

</div>

Hi,  
I just started using AS3 and I found a basic problem.  
Can’t set alpha!!  
I keep getting this error:  
1119: Access of possibly undefined property banner through a reference with static type flash.display:DisplayObject.

Basically I have 3 buttons, and everytime I click one of them I want my movieclip with instance name ‘banner’ to fade out to 50% alpha.  
All I am doing is: ‘root.banner.alpha = 0.5’  
How can I do this?  
Or even better how can I had a tween to my movieclip ‘banner’ to fade out to 50% alpha?  
Can anyone help me with this basic question?