Application Bar Icons for Windows Phone 7 - Version 2011.1 Application Bar Icons for Windows Phone 7. The icons are 48 x 48 pixels, mostly transparent, with the actual image centered to the image in a square of 26x26 pixels Technically, developers get 252 unique app icons drawn in matching style, each coming in PNG file format. Always use an image of White color with Transparent background. If you have a different theme set for your phone, the Application Bar will colorize them accordingly.Design Guidelines for Application BarYou can add an application bar to your page both from XAML and code behind. There are some design guidelines for Application bar and a developer must know about these before designing and developing their Windows Phone application.- Application Bar has in-built animation and rotation support. So, use it to keep consistency across all Windows Pone applications.