Well that's weird. It has a `commmand` attribute, but an overlay adds `oncommand="goDoCommand('calendar_publish_calendar_command')"`.
Bug 1480919 Comment 12 Edit History
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~~Well that's weird. It has a `commmand` attribute, but an overlay adds `oncommand="goDoCommand('calendar_publish_calendar_command')"`.~~ No, that's not right.
Well that's weird. It has a `commmand` attribute, but an overlay adds `oncommand="goDoCommand('calendar_publish_calendar_command')"`. ~~No, that's not right.~~ Yes it is, the `oncommand` attribute is copied from the `<command>` because of the `observes` attribute. XUL is hard. :-(