i just got bit for at least the 3rd or 4th time by
setDefaultFormProcessing().  implementing a cancel button requires that you
set this to false.  this is a hard thing to know for a beginning user.  or
for me for that matter.  ;-)  i was wondering what everyone thought about
adding AjaxCancelButton and CancelButton such that they
setDefaultFormProcessing(false).  this would be a discoverable and
self-documenting way of dealing with this issue.  true, it is
yet-another-class-in-core (or extensions would be fine), but i think it
might be nice.  
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