How to fill a shape gradually using a slider?

Hi all,

Can anyone think of a 'clever' way of using a 1-10 slider to fill up a shape 10% at a time when the slider moves?

I'm not meaning a gradient fill, more like a slider that fills a glass up with liquid as the slider moves.

I could do it using a series of images that are hidden/made visible with each slider change but that seems a bit clunky and I thought there would be a better way :)  Storyline 2 btw...

Many thanks,

Michael.

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