Part of the features being added for WPF Studio 2010.1 are Ribbon updates to use the newer Scenic ribbon style.
The new application button style will display the text content File by default as in the left of this screenshot. This is similar to how the upcoming Office 2010 renders their application button.
You could choose to use an image instead. When using an image, an arrow will render next to the image further indicating to the user that this is a button that should be clicked on.
The image displayed on the right side of the screenshot is built-into Ribbon and can be used by your applications if you’d like. Alternatively you may specify a custom image to use, such as a company or application logo icon.