Focus Group for default button

FocusGroup.as

package components{ 
	import mx.core.IFlexDisplayObject;
	import mx.managers.IFocusManagerContainer;
	
	import spark.components.Group; 
	public class FocusGroup extends Group implements IFocusManagerContainer
	{
		public function get defaultButton():IFlexDisplayObject
		{
			return null;    
		}
		public function set defaultButton(value:IFlexDisplayObject):void
		{ 
		}
	}
}