how to add tabPanel to a panel

Hello,

I created a panel with 'border' layout and in the north area i add two panel. in one of them i need to add a tabPanel.

I add the tabPanel with the code like this:

var p = Ext.getCmp('northArea_tabs');

var _tab = Ext.create('Ext.tab.Panel', {

items:[

{title: 'tab1'},

{title: 'tab2'}

]

})

p.add(_tab);

but the tabPanel is not displayed.

Anyone can tell me what happened here?

Thanks in advance.

how to add tabPanel to a panel