# 5000: The class 'gallery' must subclass 'flash.display.SimpleButton' since it is link

**URL:** https://forum.kirupa.com/t/5000-the-class-gallery-must-subclass-flash-display-simplebutton-since-it-is-link/277164
**Category:** flash
**Created:** [December 8, 2008, 10:03pm UTC](https://forum.kirupa.com/t/5000-the-class-gallery-must-subclass-flash-display-simplebutton-since-it-is-link/277164 "2008-12-08T22:03:13Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![rustyleaf](https://avatars.discourse-cdn.com/v4/letter/r/a3d4f5/32.png) [@rustyleaf](https://forum.kirupa.com/u/rustyleaf)
#### Post date: [December 8, 2008, 10:03pm UTC](https://forum.kirupa.com/t/5000-the-class-gallery-must-subclass-flash-display-simplebutton-since-it-is-link/277164/1 "2008-12-08T22:03:13Z")

</div>

I have a class that extends MovieClip and I am receiving this error…

```auto
5000: The class 'gallery' must subclass 'flash.display.SimpleButton' since it is linked to a library symbol of that type.

```

If I change the extends MovieClip to Extends SimpleButton - the error goes away but then I errors about calling addChild method being undefined…

A bit of a lose lose - any hints? :q: