The mainBar tag, and some of the training documentation, incorrectly imply you need to define a paragraph that links to the dialog definition for a pages properties.

The tag doesn't work like that. It uses the value provided in the paragraph attribute to directly find the dialog by node name.

As mainBar and page properties are not conceptually related to paragraphs I think this behaviour is correct but I would suggest adding an attribute "dialog" and deprecating attribute paragraph in the tag.