Default subpage for a page

Hi, I would like to make a combination of horizontal (tab) and left-menu navigation so that when you click on a tab, the first of the subpages of that page is displayed instead of the page itself. How to achieve this? Thanks.

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AcruxFarmer replied on at Permalink Reply
Hello I don't have a behind the seen solution for your problem, I had to do a work around and hard code my main nav bar into the actual template. By doing it this way I worked around that very situation and directed my link to the proper page via the page alias.

This works well if you never plan on adding any additional pages to your main nav.