# Class file linkage issue

**URL:** <https://forum.kirupa.com/t/class-file-linkage-issue/243776>\
**Category:** Uncategorized\
**Created:** [November 10, 2007, 7:31pm UTC](https://forum.kirupa.com/t/class-file-linkage-issue/243776 "2007-11-10T19:31:04Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ywenz](https://avatars.discourse-cdn.com/v4/letter/y/edb3f5/32.png) [@ywenz](https://forum.kirupa.com/u/ywenz)\
**Post date:** [November 10, 2007, 7:31pm UTC](https://forum.kirupa.com/t/class-file-linkage-issue/243776/1 "2007-11-10T19:31:04Z")

</div>

Here is what I have…

MC\_B is inside MC\_A

MC\_A is linked to class “Test” from Test.as. Test class contains public function **setAlpha();**

Inside **setAlpha()**, I have:

```php
MC_B_IdentifierName._alpha = 0; //keep in mind that MC_B is inside MC_A

```

MC\_A is attached to the stage by an onRelease event of MC\_C, which are all defined inside another class that is linked to MC\_C. So the code inside the OnRelease event is:

```php
var item:MovieClip = this.attachMovie("MC_A", "InstanceofMC_A"+i, i+21, {_x:xPos, _y:420});
item.setAlpha();

```

So At runtime, MC\_C is first attached to the stage, then I click on it which attaches MC\_A and calls **setAlpha().** The error I’m getting at that point is:

**There is no property with the name ‘MC\_B\_IdentifierName’.**

I don’t know why setAlpha isn’t able to see **MC\_B\_IdentifierName** given that MC\_A is linked to the class setAlpha is a public member of.

Any ideas why? THanks!