Making graphics respond to data value changes

The following screenshot shows a triangular shape, named DepartmentMarker, added to the group shape of the Person master in the Document Stencil:

Notice that the top group shape is currently named Sheet.5. This is the default name, and it will remain as the NameID property even if the shape is renamed. In fact, 99% of Masters have the top group Shape with an ID of 5. NameID is the ID of the shape preceded by sheet making it Sheet.5.

To make the color of the DepartmentMarker Shape change whenever the value of the Department Shape Data row changes, the following formulas were entered:

FillForegnd=GUARD(TONE(RGB(Sheet.5!Prop.Red,Sheet.5!Prop.Green,Sheet.5!Prop.Blue),50))

FillPattern=GUARD(1)

The RGB(r,g,b) function takes three numbers between 0 and 255 for the red, green, and blue values. These are obtained from the respective Shape Data rows (Prop.Red, Prop.Green, and Prop.Blue) in the parent group Shape, Sheet.5. However, in order to mute the color...