Simplest keyboard listening captures only some keys, not others

programming flash
1

I have the simplest code and when I run it, there is no trace for most of the keys. It traces the W, and the U, but none ofthe other letter on that row. It traces all numbers, but not the - and =. It does trace shift- and shift=, the space bar, but not the enter or the escape. What could be the problem?

 	import flash.display.MovieClip; 	import flash.events.KeyboardEvent; 	import flash.ui.Keyboard; 	 	public class Application extends MovieClip { 		// Constructor 		public function Application() { 			stage.addEventListener(KeyboardEvent.KEY_DOWN, stage_keyDownHandler); 		}  		private function stage_keyDownHandler(e:KeyboardEvent):void { 			trace(e); 		} 	}