update interface when slidertime changes

Hey Guys,

One more question for today ;)
I would like to update one of my rollout spinners, whenever the user changes the slidertime. Unfortunately I don't know how to do it in an elegant way. I could just look for changes in slidertime 20 times a second etc. but I would prefer something like a change handler: "when slidertime changes do update".
Any ideas?

Regards,
br0t