непонятки с ассоциативным массивом

[Pablo4d]

Делаю так:

public function openForm(__form:Class):void
		{
			if (isFormOpen(__form.name))
			{
				return;
			}
			var form:IFlexDisplayObject=PopUpManager.createPopUp(DisplayObject(Application.application),__form,false);
			addForm(form);
		}
		
		public function addForm(__form:Object):Boolean
		{
			if (isFormOpen(__form.name))	
			{
				return false;
			}
			aForms[__form.name]=__form;
			return true;
		}
		
		public function removeForm(__form:Object):Boolean
		{
			if (isFormOpen(__form.name))	
			{
				delete aForms[__form.name];
			}
			return false;
		}
		
		public function isFormOpen(__name:String):Boolean
		{
			if (aForms[__name]!=null)
			{
				return true;
			}
			return false
		}

Но в массив не добавляется при

aForms[__form.name]=__form;