Scrolling panel change with triggers?

Has anyone tried and was able to make the scrolling panels go from hidden to the normal state based on triggers or another route?

I'm creating a timeline with the slider and different text appears on each different position of the slider. There are a couple of different spots where I need to use a scrolling panel. The problem is if I do not hide the scrolling panel then the scroll bar shows on the slide the entire time. 

I originally tried making the initial state of the scrolling panel hidden and then using a trigger based on the slider to activate the scroll panel to go to the normal state but the triggers do not recognize the scrolling panel.

Any ideas?

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Montse