For what it's worth, here is what I ended up using:
$('#some-container').delegate('input.to-autocomplete', 'focus', function(e) {
$(this).autocomplete({
source: autocomplete_url
});
});
$('#some-container').delegate('input.to-autocomplete', 'blur', function(e) {
var target = $(this);
if (target.hasClass('ui-autocomplete-input')) {
target.autocomplete('destroy');
}
});
, , () , .