In most of my flash projects I have a prototype file I include into the project. It contains additions to core objects such as Object, MovieClip, etc. Well, today I found out that some Macromedia components (ComboBox was the one I was having trouble with) don’t like additional methods to be defined on certain classes (Object was the one I found that ComboBox was having issues with); they fail to continue to work with additional methods defined.

However, there is a workaround: ASSetPropFlags. Simply hide all additional methods with this line of code:

ASSetPropFlags(Object.prototype, null, 1);

I can’t wait until AS3 can be used all the time.

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1 Responses to “”


  • I haven’t quite got my head around ASSetPropFlags yet. This is exactly what I was looking for.

    For the record, here are the components I have had this problem with:

    mx.controls.List
    mx.controls.ComboBox
    mx.controls.Menu

    I haven’t dug into what’s causing it since the EULA forbids us from distributing patches anyway. This workaround seems fine so far.

    Thanks :)

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