Scrollbar Size..?

Hi - I have used the scroll component on a dynamic text box which i have filled with text i have also skinned the component so that it matches the site theme.

But what i would like to know is if you can make the scroll bar slider just one simple size, at the moment the slider size changes depending on how much text is within the dynamic text box, is there any action script i need for this?

If anyone could help would be much appreciated!

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