Styling the windows 8 app bar
It’s important to stick to the recommended sizes, placing and padding. The app bar is designed to hold 10 buttons in both orientations.
What you can change is the styling of the app bar.
For instance the color of the text, symbols and circles to match your branding.
This is “Demystifying Windows 8 app bar” part 5 of 8.
Part 6 “Icons for the Windows 8 app bar”