[flexcoders] Keydownhandler fires twice for each keystroke

[aceoohay]

Flex 2.0.1

I am trying to capture keystrokes in the keyDownHandler of a 
ComboBox and it appears to be firing twice for each keystroke.

Any ideas on what might cause this?

The code below works except that when the user strikes a <backSpace> 
it removes two characters from _typedText.

Paul

                override protected function textInput_changeHandler
(event:Event):void
                {
                        _typedText += this.textInput.text;
                        if (!findFirstItem(_typedText))
                        {
                                _typedText = _typedText.substr
(0,_typedText.length -1);
                                findFirstItem(_typedText);
                        }
                }
                override protected function keyDownHandler
(event:KeyboardEvent):void
                {
                    if(!event.ctrlKey)
                        {
                                if (event.keyCode == 
Keyboard.BACKSPACE || event.keyCode == Keyboard.DELETE)
                                {
                                        _typedText = 
_typedText.substr(0,_typedText.length -1);
                                        findFirstItem(_typedText);
                                }
                        }
                }