Extjs - Toolbar button menu dropdown with submenus. It's possible?

Have a look at this example! You can achieve using the Ext.menu.Menu class. Here is an Example:

{
    text: 'Main Menu',                      
    menu: {
        xtype: 'menu',                          
        items: [{
                text: 'Menu One',
                iconCls: 'edit'
            }, {
                text: 'Menu Two',
                menu: {
                    xtype: 'menu',
                    items: [{
                        text: 'Next Level'
                    },{
                        text: 'Next Level'                      
                    },{
                        text: 'Next Level'
                    }]
                }
            }, {
                text: 'Menu Three',
                scale: 'small'
            }, {
                text: 'Menu Four',
                scale: 'small'
        }]                          
    }
}