You can extend a new method to trigger the 'onChange' event.
$.extend($.fn.combo.methods, {
triggerChange: function(jq){
return jq.each(function(){
var c = $(this);
var opts = c.combo('options');
var v = opts.multiple ? c.combo('getValues') : c.combo('getValue');
opts.onChange.call(this, v, v);
})
}
})
Calling the 'triggerChange' method will fire the 'onChange' event.
$('#cc').combo('triggerChange');