反射机制的研究

　　在某些情况下需要通过配置文件来获取类名进而进行实例化。
　　 
　　 
　　 
　　flex can't complie the class into swf file, then runtime error will occur,I don't know whether there is some solution
　　var obj:Object = getDefinitionByName("GCComponent.MyTestComponent") ; //as Class; 
　　var ClassReference:Class = obj as Class; 
　　var ins:Object = new ClassReference(); 
　　ins.width = 100; 
　　ins.height = 10; 
　　ins.x = 0; 
　　ins.y = 0; 
　　this.addChild(ins as UIComponent);         
　　} 
　　]]>