Currently, I can see only a few related to the Closing and Saving of the document...Document Will Save, Document Will Close, etc.
There is no "Add" button in the Document Actions dialog box that appears when one clicks on Other Tasks when editing a form-based document.
no GUI counterpart appears to be available.
To get to the Page Open/Close events, open the Pages navigation pane, select the page you want, right-click > Page Properties > Actions
Thanks for that George....I would have never found that "feature" !!