Heading-Rollover-Color
This property allows you to set or retrieve the color that both column and row headings assume when the mouse pointer hovers over them. Foreground and background color values are combined and therefore RGB colors are not supported. See "Color management" for further details.
 
Example - Define a grid whose heading colors change on mouseover
screen section.
...
  03 screen-1-gr-1 Grid
     line 5.7
     column 3.1
     size 34.6 cells 
     lines 15.5 cells 
     id 1
     event procedure screen-1-gr-1-evt-proc
     no-box
     column-headings
     row-dividers 1
     end-color 9
     heading-rollover-color 200
     heading-font Default-Font
     cursor-frame-width 3
     num-rows 5
     .
...