Tree Component with incremental auto-refresh?

Is there a free (preferably) or commercial JSF tree component with a general AJAX-based incremental auto-refresh?
Essentially when dealing with a tree of data which can lose or add nodes at any time, it would be nice to have an optional polling mechanism built into the tree that would check the server for tree insertion and removal events and handle any such events whenever they're found via incremental AJAX-based modifications to the tree -- not a full refresh. The same is true for tree node change events.
To be clear this is not a substitute for handling client events -- the tree data is indicative of shared state and changes independently from user actions.

I was following instructions from [http://niallcblogs.blogspot.nl/2009/06/auto-refreshing-adf-chart-objects-in.html]
But I got it to work the way you say.
But setting refresh="always" generates exceptions in even simple cases. Is it because I am using MySQL which does not have event notification support?

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Tree Component with incremental auto-refresh?

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