Expand and Collapse

Is it possible to expand and collapse nodes that are linked. In other words, if I have a node with three children, can I collapse it so just the parent is showing?

Are you talking about independent GoObjects (GoNodes) that are related by links? If so, check out the TreeApp sample.
Are you talking about a GoNode that is a parent/owner/container of the other nodes? If so, check out the GoSubGraph class. We’re adding new features to GoSubGraph in our next release, as you can read elsewhere in this forum.