Hi Dittmar,
Are you talking about a dbView with a CJ commandbar and the cDRReport object that is the report previewer (C_DRPREVIEW_EMBEDDED) ?
If so what you need to do is set the pbActiveUpdate of all toolbar objects that you want to get automatically updated to true.
Did you know you can control what toolbar buttons to appear by setting properties as pbPreviewerShowxXXX to true/false?