Question: I'm making my first step in to creating Universal applications - does anyone know what the top bar control is in the Alarms and Clock app?

I noted that the middle section is a Pivot and it's switching between PivotItems - but when you change the top icons are highlighted based on the PivotItem

![Alarms and Clock](https://i.stack.imgur.com/h6s8e.png)

Is it just a Grid with different buttons that are highlighted depending on the SelectedIndex of the Pivot control? Or is it a specific control that hasn't been documented yet?

Answer: 
They're just using a pivot with a custom header template.

This should provide some insight:
<https://msdn.microsoft.com/en-us/library/windows/apps/dn997788.aspx>
You can always debug any Win10 application by running visual studio and attaching the debugger to the process (app) you want to look into. 

This will also give you all of the styles available and give you a better understanding of the layout. I demo'd this as part of the //BUILD tour earlier this year.