ext window 缩放

collapsible :true,

win = new Ext.Window({
                applyTo:'hello-win',
                title:'test2',
                resizable:false,
                layout:'fit',
                width:500,
                height:300,
                closeAction:'hide',
                plain: true,
                minimizable:true,
               collapsible :false,                draggable:false
})