It looks like @rxunique is asking for an entity that appears like a frame which has tabs on it and when you select the tabs on top it renders whatever you apply in the "tabbed" area. Per the example... and not related links to other "pages", but that entity rendered on a page.
I'm guessing here, but you probablly need to build your own HTML template for the box frame content and show buttons at the top which you'd select as "tabs" in order to control content.
Don't forget that you can use any front-end framework you like with uibuilder. I chose Vue v2 and bootstrap-vue for people with limited front-end coding experience. These days, there is a lot of choice so pick one you are comfortable with.