Hello Greg,

did you see the demos in the demo browser about the tree controller? [1]
There are some good examples which should you get started.
Additionally, take a look at the documentation about the controller [2].

Is this sufficient?
It highly depends on the structure of your data and what you want to display in 
your tree.

Do I need to bind anything else together, or can I
just bother with changing the data in the controller and be done?
Thats the main idea about it. If you just want to have the labels in your tree, 
thats all you need to do.

Also, if I were to just change one value in the tree, not the whole
model, how would I signal the controller that the UI  should be
updated?
You don't have to. Changing a single string in the model will update the tree 
view automatically.

I hope that helps,
Martin

[1] http://demo.qooxdoo.org/current/demobrowser/# (Search for controller.Tree)
[2] 
http://manual.qooxdoo.org/1.3.x/pages/data_binding/controller.html#tree-controller
<http://manual.qooxdoo.org/1.3.x/pages/data_binding/controller.html#tree-controller>

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