I am dissecting interactiveconfigurator.hype which demonstrates a selector to change the colors of a sofa. I cannot figure out how this was done. Does anybody know of a video that demonstrates how this is done in Hype?
Peter G
it uses timelines to show and hide images by changing their opacity 
THE typicall hypeapproach
A video showing timelines is here:
The interactive configurator example uses a technique called Relative Keyframes which allow alternate timelines to animate properties from whatever their current value happens to be.
I recommend downloading this tutorial zip and looking at the “04 Intro to Timelines.hype” document that covers a lot of timeline info.