T5: Ajax update of BeanEditForm on drop-down select?

[Franz Amador]

I'm using BeanEditForm to generate a form that includes a drop-down selector.  
I'd like to get an event when the user selects a value so I can update other 
fields in the form, preferably via a partial-page Ajax-style update.  Is this 
possible?  If so, is there an example I can look at?  If not, is there a way to 
do this with a regular form?  Thanks!