public Object execute(final ExecutionEvent event) throws ExecutionException {
// assumes there is only one application node
final IApplicationNode applicationNode = ApplicationNodeManager.getApplicationNode();
final List<ISubApplicationNode> children = applicationNode.getChildren();
final INavigationNode<?>[] nodes = children.toArray(new ISubApplicationNode[children.size()]);
final INavigationNode<?> nextNode =
toNext ? findNextNode(nodes) : findPreviousNode(nodes, true);
if (nextNode != null) {
nextNode.activate();
}
return null;
}
