how to remove all items from a tree

I have an ajax tree (dojo.store.JsonRest) and I would like to have a button
to clear it out so it will do json again to populate (if it gets out of
sync). I have tried various things on the forum and couldnt figure out how
to do this. Any ideas?

Thanks,
Chris

Dojo-interest [ at ] mail.dojotoolkit.org