[FIXED-162] Docked back button in tabpanel's tabbar not appearing correctly

[=NR=]

I'm getting this error while trying to do this..

Hope that you can explain to why this happened:

Uncaught Error: [ERROR][Ext.Container#doAdd] Adding a card to a tab container without specifying any tab configuration

General structure of my view:

• Tabpanel
  
  • fullscreen: true
  • 
    
    • item 1 => list
    • item 2 => tabpanel with supposedly docked button on the left
      
      • layout fit

the dockedItems for the button need to be outside of tabbar, right?

Ext.setup({
    onReady: function(){
        var t = {
            title: 'Tab Tab Tab Tab Tab Tab'
        };
        new Ext.TabPanel({
            fullscreen: true,
            dockedItems: [{
                dock: 'left',
                xtype: 'button',
                text: 'A',
                stretch: false
            }],
            tabBar: {
                scroll: 'horizontal'
            },
            items: [t, t, t, t, t]
        });
    }
});

UPDATE: I did not put title for dockedItems - button that is the reason of the error