Hi Silver,
XPToolbars are limited to BarItems only. However, a CommandBar can host a single control, which could be a ComboBox (or a Panel that contains one or more ComboBoxes).
If you''re using a BarManager in your application, please take a look at
this forum post. It includes a sample that might help you and some information about a known issue to watch out for.
Regards,
Gregory Austin
Syncfusion, Inc.