I believe you can get the result you are looking for by setting tabPosition:'left'
on the tab panel.
I've created a sencha fiddle for demonstration:
var panel = Ext.create('Ext.tab.Panel',{
renderTo:Ext.getBody(),
tabPosition:'left',
height:400,
width:1000,
items:[{
title:'Item 1'
},{
title:'Item 2'
}]
});