Flex Auto Complete / Predictive Text Example

Ok this basically works with a change event placed on a textInput or other component you can modify it to your needs

<-- First the action script -->
<--
Now create a variable that will be your dictionary this can come from a query or whatever
-->
private var xDictionary:Array = ["Alan","Brad","Cindy","Dana","Elizabeth","Frank"];
private var regexp:RegExp;

private function xTestInput():void{
var i:int = 0;
var temp:Array = xDictionary.filter(filter);
txInput.text = temp[0];
}

private function filter(element:*,index:int,arr:Array):Boolean{
regexp = new RegExp(txInput.text);
return (regexp.test(element as String));
}

<--
And in your MXML
-->