Spin button

["Amadeus W. M." <amadeus84 cablespeed com>]

I have a spin button and I want a callback to be called ONLY when the
spinning has stopped. If I connect it to "value changed", the callback
gets called each time the value has changed, which is too often. What's
the right signal to connect to?

An unrelated question: how do I change the default gray background of
a widget? Say, I want to make a red button, how do I do that?

Thanks!