Someone

Ext.onReady(function(){

    var man_acc_button = new Ext.Button({
        text: 'My Account'
    });
    var man_acc_button2 = new Ext.Button({
        text: 'My Account'
    });

    var x = new Ext.Panel({
        renderTo: document.body,
        layout: 'vbox',
        height: 100,
        width: 100,
        layoutConfig: {
            pack: 'center',
            align: 'center'
        },
        items: [man_acc_button, {
            xtype: 'spacer',
            height: 10
        }, man_acc_button2]
    });
});