This property, used in conjunction with the Fill-Percent property, defines the color used to fill the portion of frame not filled with the color set in the Fill-Color property, when the value of the Fill-Percent property is less than 100. The default value, zero, indicates that no color must be applied to that frame portion. See "Color management" for further details.

 

Example - Define a frame control with 2 fill colors, white and gray, the fill-percent tells the percentage for the first fill color and the rest is for the other fill color