 		public function Signal(name : String)
 		{
 			_name = name;
+            _callbacks = new <Function>[];
 		}
 		
 		public function add(callback : Function) : void

{
	public final class Signal
	{
		private var _name			: String	= null;
		
		private var _callbacks		: Array		= [];
		private var _numCallbacks	: uint		= 0;
		
		private var _executed		: Boolean	= false;
		private var _numAdded		: uint		= 0;
		private var _toAdd			: Array		= null;
		private var _numRemoved		: uint		= 0;
		private var _toRemove		: Array		= null;
		
		public function get numCallbacks() : uint
		{

				if (_toRemove)
					_toRemove.push(callback);
				else
					_toRemove = new <Function>[callback];
				++_numRemoved;
				
				return ;
