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<p>
The "TreeExpanderButton", which changes the <a>Node.isTreeExpanded</a> property, really only works with tree structures.
When you want to hide/show the "downstream" nodes from a given node, using the "TreeExpanderButton" might not do what you like,
especially when there are cycles in the graph structure.
</p>
<p>
Instead, this sample implements a "Button" with custom behavior to modify the visibility of each Node.
If this behavior is still not quite right for your app, you can adapt the behavior implemented in the
</p><pre>collapseFrom</pre> and <pre>expandFrom</pre> functions to use different criteria for when to stop recursion.
<p></p>
