To change the background color of the badge:
1. Left button click anywhere in the gray area to select it and press the left side toolbar button. (Or you can Right click on the background area as a shortcut.)
2. A dialog will appear which says “Background” under “Content Format”, click on Background in the Color section
3. Another dialog will appear containing colored squares, select the square of your choice and click on OK. (If you are adventurous you can try defining a custom color.)
4. Click on OK in the first dialog, the badge background will change to the selected color