Actionscript 3 combo box onchange event

// import the class
import fl.data.DataProvider;

// create and load some data into the comboBox
// this one is already on the stage but you can also var myCBox:ComboBox = new ComboBox(); etc.
var dp:DataProvider = new DataProvider();
var sortFilters:Array = [ ["value 1", "Label 1"], ["value 2", "Label 2"], ["value 3", "Label 3"], ["value 4", "Label 4"],];

for (var i:uint=0; i < sortFilters.length; i++) {
dp.addItem( { label: sortFilters[i][1], data:sortFilters[i][0] } );
}

myCBox.dataProvider = dp;

// add the listener
myCBox.addEventListener(Event.CHANGE, changeHandler);

function changeHandler(event:Event):void {
whateverYouWantToHappen();
}