Windows Phone 7.5/8 SDK
How to integrate pivot controll IN app bar?
For example "UC Browser" using this and I think it's very useful thing. bit.ly/UmyFot
This sample not work, just to present how I imagine that.
<phone:PhoneApplicationPage.ApplicationBar>
<shell:ApplicationBar Mode="Default" IsMenuEnabled="True">
<controls:Pivot>
<controls:PivotItem Header="first">
<TextBlock Text="an item"/>
<TextBlock Text="an item two"/>
</controls:PivotItem>
</controls:Pivot>
</shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>
This is custom realized control.