# Tweener: 'alpha' not a property?

**URL:** <https://forum.kirupa.com/t/tweener-alpha-not-a-property/324788>\
**Category:** flash\
**Created:** [September 9, 2011, 12:39am UTC](https://forum.kirupa.com/t/tweener-alpha-not-a-property/324788 "2011-09-09T00:39:51Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![tpann](https://avatars.discourse-cdn.com/v4/letter/t/c67d28/32.png) [@tpann](https://forum.kirupa.com/u/tpann)\
**Post date:** [September 9, 2011, 12:39am UTC](https://forum.kirupa.com/t/tweener-alpha-not-a-property/324788/1 "2011-09-09T00:39:51Z")

</div>

I have a custom class in which I create a large number of display objects pulled from the library. Each has its alpha set to 0 initially. Then a series of functions call Tweener.addTween to change their alpha to 1 and other such fun things.

(I did import caurina.transitions.\*)

I also have a public terminate() function in this class that I call from the FLA when I click a button.

AFTER this class has been added to the stage – and AFTER all of these display objects got through their various tweens and become visible – I hit the button which triggers the class’s terminate() function.

Oddly I get this statement for each of the display objects:

```php
## [Tweener] Error: The property 'alpha' doesn't seem to be a normal object property of [class WirelessPhoneIconFP] or a registered special property.

```

Meanwhile the objects disappear as they’re supposed to.

Any explanation for why alpha is suddenly not recognized, even AFTER Tweener successfully changed the alphas of all of these display objects?