Graphical User Interface Overview : Introduction : Scroll Indication
 
Scroll Indication
In some cases, menus, status panels, or other lists contain more information than can be displayed in the available area. In these cases, the top or bottom of the panel will have a fade-to-white appearance as shown Figure: Scroll Indication. You can scroll the control to move it up or down and expose the hidden information.
Scroll Indication
1. The fade-to-white at the bottom of the status panel and marker table here indicates that there is more information below the display area. The panel can be scrolled by dragging it upward to expose more information.
2. The fade-to-white at the top of the menu here indicates that there is more information above the display area. The menu can be scrolled by dragging it downward to expose the information.
Note 
If the display is set to another color theme, the fade effect remains the same but the color may fade to a darker shade.