Expand and remove nodes from the visualization by clicking a node. It gets a halo,
where you can dismiss a node, expand/collapse child relationships, or unlock the
node to re-layout the graph. Double-clicking a node expands its child relationships.
@dana.canzano Thanks for the reference. Can you define the meaning of unlock the node to re-layout the graph? It does not do anything for me after selecting it. I am always able to move the node around. Thanks.