[NePridymal]

Вот с защитой от дурака...

package
{
	

	// Singleton class
	
	public class MyClass
	{
		
		
		
		private static var instance:MyClass;
		
		public function MyClass(block:Blocker):void
		{
			if (instance == null) instance = this;
		}
		
		
		public static function getInstance():MyClass
		{
			if (instance == null) instance = new MyClass(new Blocker());
			return instance;
		}
		

	
		
	}
	
}

	// блокиратор конструктора MyClass 

	internal final class Blocker
	{
		public function Blocker():void
		{
		}
	}