creo3 config.pro option documentation for: SYSTEM_DIMMED_MENU_COLOR
system_dimmed_menu_color
<0.000000 0.000000 0.000000>
Defines the default color of unavailable menu items. The three real numbers from 0 M-^S100 specify a percentage of red, green, and blue, respectively, in the resulting color. For example,0 0 49
defines a medium blue.