It's a relatively common pattern, one input that's narrowed in scope based 
on another input's selection(s).  Prior to hobo 2, one could do something 
like this:

      Hobo.ajaxRequest(window.location.href, ['part-name'],
        { params: Form.serialize(this.up('form')), method: 'get', message: 
"Updating...", asynchronous: false });

Apply that to any event you'd like on an input in a form and you can update 
another part of the form.

But with 2.0, the only documented way to interface with ajax is through a 
form or link update.  I've ran through it once, creating a form and copying 
the inputs over into a hidden form and then submitting that.  

Before I repeat that effort, I figured that there had to be a better way, 
something closer to what 1.3 had and wanted to see if anyone had 
suggestions.  

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