I've created a SF DevExpress Maintenance form and I want to know if i could add my own buttons or what not to the MaintenanceFormToolbar.

The problem is the DevExpress toolbars...I really don't like the way that they manage their bars at all.  You will not be able to add new buttons to the MaintenanceFormToolbar itself, but you can add another toolbar through the same BarManager control.  At present this is just the way it is with the DevExpress toolbars since we have to be able to control the buttons of the MaintenanceFormToolbar.  Sorry.