If you create subpages and don't put any boxes on the page under which the subpages are grouped, a linked list of the subpages will automatically display on the page. See an example listing that is automatically generated, and compare it with a manually created page directory that is re-used on each of the subpages.
We've observed that when some users hover over a tab and the subtab list appears, they don't realize that the top level tab is still an option to select. If you have unique content on the main page of the tab that is not replicated elsewhere, those users may never discover it. Consider moving all of that content to a new subtab and leaving the main tab's page empty.
Another option is to create a fake subtab which links to the content on the main tab's page. For example, on the Art Education guide, the tab for "Books & Online Reference" has two subtabs. The subtab for "Books" actually links to the main tab page and the subtab for "Online Reference Sources" links to another guide.
The Spring 2010 update brought a very welcome change. You can now control the order in which subpages are listed in the dropdown.
When you create a new subpage it is added to the end of the list by default. To change the order in which the subpages are displayed, from the drop-down options under Add/Edit Pages, select "Reorder Pages". On the Reorder Pages box that opens, change the drop-down from "Reorder the top-level pages" to the page whose subpages you want to change. Then drag the subpages into the desired order and save.
The following instructions are no longer needed, but are retained for archival purposes.
The subpages will automatically display in alphabetic order, but sometimes you might want to force them to display in a specific order.
If you want a specific subpage to appear at the beginning of the list, begin the title of the page with a dash and a space, e.g. "- General Resources"
If you want to control the order of the entire list of subpages, begin the title of each subpage with a number. For example, look at this guide's "Page Listing Subpages" tab.
If users might look in more than one place for particular information, you can create links to direct them to the appropriate location. For example, in this guide's "Don't Start from Scratch" tab, the last subpage for "Copy an existing link" doesn't actually exist as a subpage of that tab; instead it links to the "Reusing Links" page.
Caution: If you decide to change the name of a subpage that is linking to a different location, copy the URL address BEFORE you select "Change Page Name" because when the window opens up to change the subpage's name, the URL field will be blank. If you forgot to copy the URL address, then cancel the name change, go back and copy the URL, reopen "Change Page Name" and paste the URL into the field.
NOTE: If you copy a guide that includes these types of links in the tabs and subtabs, you'll need to change each URL by selecting the "Change Page Name" option in the "Add/Edit Pages" drop-down list in the Command Bar. Otherwise the links in the tabs and subtabs will direct the user back to the original guide that you copied.