http://jsfiddle.net/FrEHv/384/The onSelect() event is not fired if one of the data values is set to selected:true.
This needs to work for me, as combobox values are loaded via ajax and this selected value then needs to trigger loading of other data on the page for the record where selected = true.
Also, when loading a form containing a combobox, the onSelect() event also does not fire, this means that when loading a form that contains a combo and that combo is supposed to show / load other info based on it's selection, it does not work.