you can easily achieve this via setting the Pivot.SelectedIndex
like
for forward
if(Pivot.selectedIndex < Pivot.Items.Count)
Pivot.selectedIndex++;
else
Pivot.selectedIndex = 0;
for backward
if(Pivot.selectedIndex > 0)
Pivot.selectedIndex--;
else
Pivot.selectedIndex = Pivot.Items.Count - 1;
13
solved how to handle pivot swipe gesture through button click event in windows phone [closed]