SetToolboxSymbolProperty

"AfterStatusType"

If "Fill to status" is set for symbols on the schedule, then it's possible to use an after status shape.  Integer (1-137)

"CustomDateFormat"

Arg 3 is the custom date format.

"DateBack"

Background for the symbol date. Arg 3 is "Transparent" or "Opaque"

"DatePosition"

Position of the symbol date. Arg 3 is the position. See text positions.

"FillColor"

Arg 3 is the color. See color numbering.

"FillColorAfterStatus"

Arg 3 is the color. See color numbering..

"Highlight"

Arg 3 is 0 or 1

"LetterMark"

Arg 3 is "M", where M is the letter marking (use any letter or number).

"MarkingOverlay"

Arg 3 can be from 0-20.  These values map to the 21 options available in the Marking dropdown in the Symbol Options dialog. The 0 value means no marking as this is the default.

"OutlineColor"

Arg 3 is the color. See color numbering.

"ShadowColor"

Arg 3 is the color. See color numbering.

"ShadowSize"

Arg 3 is 1=small 2=medium 3=large

"ShowShadow"

Arg 3 is "On" or "Off"

"Special"

Same as "Usage" (above)

"SymbolSize"

Symbol size. Arg 3 is the size.  Valid values are from 0.0 to 5.0 (0.0 means reset to default, .1 to 5.0 are valid override size options).

"TextBack"

Background for the symbol text. Arg 3 is "Transparent" or "Opaque"

"TextPosition"

Position of the symbol text. Arg 3 is the position. See text positions.

"Type"

Symbol shape. Arg 3 is 1-137. See symbol shapes.

"Usage"

Arg 3 is "Status" or "Comment" or "Baseline"  

"VerticalLevel"

Arg 3 is the Vertical Level