Add a "change text size" option in Dashcode

I am building an RSS widget. I want to figure out a way to have a slider, which a user can slide to change the size of the font in the RSS feed. How do I do this?

See whether this movie will help: FormFormatting.mp4 - Google Drive
Note the other items  that can be adjusted.

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    > I would like to allow users to easily change the text
    size of a website I
    > am
    > designing.
    >
    > To see an examplme, go to the Dell website
    (www.dell.com), on the bottom
    > left
    > there is a link to enlarge the text (or bring it back to
    normal size).
    >
    > Is this something that I can do through dreamweaver, or
    maybe CSS?
    >
    > Thanks in advance for your help!
    >
    > Jose
    >

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    Actionscript 3:
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