extjs扩展自己的组件

http://www.iteye.com/problems/15242

myWindow = function(cfg){  
     Ext.apply(this,cfg); //属性拷贝,apply将会覆盖目标对象中的属性  
     Ext.onReady(this.init, this);  
}  
 
Ext.extend(myWindow, Ext.util.Observable,{  
     init: function(){  
          
        this.formPanel = new Ext.form.FormPanel({  
             width:280,  
             height:280,  
             labelWidth:50,  
             frame:true,  
             defaultType:'textfield',  
             items:[  
                 {  
                 fieldLabel:'name' 
                 },  
                 {fieldLabel:'age'}  
             ],  
             buttons:[  
             {text:'add'}  
             ]  
         });  
          
        this.showWindow = new Ext.Window({  
             width:300,  
             height:300,  
             title:'坏蛋吧',  
             items:[this.formPanel]  
         });  
        this.showWindow.show();  
     }  
});  
 
new myWindow();