var win = new Ext.Window({  
                title : "Ext.Window1",  
                resizable : true, 
                width : 350,  
                height : 300,  
                html : "Hi, my name is Ext.Window!",  
                buttonAlign : "left",  
                buttons : [{text:"setTitle"},{text:"close"}]  
            });       
            win.show();