property Edit.BackColorLockedLine as Color
Retrieves or sets a value that indicates the line's background color when it is locked.

TypeDescription
Color A Color expression that indicates the background color for locked line. 
Use the BackColorLockedLine property to specify the background color for locked lines. Use the LockedLine property to lock a specific line. Use the ForeColorLockedLine property to specify the foreground color for locked lines. Use the Locked property to make read-only the entire control.