How to: Use Different Scrolling Modes in NavBarControl Groups

NavBarControl groups support three scrolling modes:
- Buttons. The Up and Down buttons are used.
- ScrollBar. ScrollBar is used 
- None. Scrolling is disabled.
To control scrolling in NavBarControl, use the ScrollingSettings.ScrollMode attached property. 
Note that you can specify scrolling mode for each group separately using the NavBarGroup.GroupScrollMode property.