public ActionCallback expand(DefaultMutableTreeNode node) {
final Object userObject = node.getUserObject();
if (!(userObject instanceof NodeDescriptor)) return new ActionCallback.Rejected();
NodeDescriptor desc = (NodeDescriptor) userObject;
final Object element = myBuilder.getTreeStructureElement(desc);
final ActionCallback result = new ActionCallback();
myBuilder.expand(
element,
new Runnable() {
public void run() {
result.setDone();
}
});
return result;
}
