AddDocked

var panel = Ext.create('Ext.panel.Panel', {
title: 'Panel Header',
width: 500,
height: 200,
bodyPadding: 10,
html: 'Panel Content',
renderTo: Ext.getBody()
});

panel.addDocked({
dock: 'top',
xtype: 'toolbar',
items: [{
text: 'button'
}]
});