>Create an ExtensionHandler and attach it to your preview and listener. You can easily add new buttons to the toolbar from code in the Extension Handler.
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Cathy,

Thanks a lot for your reply. Do you have any samples how this is done? Should I create my buttons with code in some separate library and then would be able to add them to the toolbar?

I was thinking of looking up the ReportPreview.app source code and taking the ideas from there.