[ExtJs] Popup - clean Window object

var button = Ext.get('show-btn');

button.on('click', function(){


var win = new Ext.Window({
title: 'Layout Window',
closable:true,
width:600,
height:350,
//border:false,
plain:true,
buttons: [{
text: 'Save',
handler: function(){
if(nav.getForm().isValid()){
nav.getForm().submit({
url: 'uploadFile.htm',
method:'POST',
waitMsg: 'Uploading your file...',
success: function(nav, o){
popupMsg('Success', 'Processed file "'+o.result.file+'" on the server');
dlgPopup.hide();
},
failure: function() {
popupMsg('Fail', 'Fail to upload file "'+o.result.file+'" on the server');
dlgPopup.hide();
}

});
}
}
},{
text:'Close',
handler:function(){
win.close();
}
}]
});

win.show(this);
});