BackColorLocked
Color of the panel button when it is selected and stays selected. Valid value is a web color name, system color name, or an RGB hexadecimal number (prefixed by a hash mark). (Decimal RGB colors are not supported.)
This property can only be set in the .ini file.
;usys.ini [application] panel=upanel(BackColorLocked=Color)
For more information, see Standard Colors .
For example:
;usys.ini [application] panel=upanel(backcolor=blue;backcolorlocked=white)