The color the referenced transition's arrow is filled with, or null when no fill color override is applied.
This property sets the transition arrow's fill color only. Use TransitionReference.LineColor to color the transition wire and arrow border.
Setting null means no fill color is applied, in which case the transition falls back to ITransition.FillColor.
Setting a new value overwrites any existing fill color for that transition. Setting the value back to
null removes it.
Getting or setting this property has no effect, and getting it returns null, when the
TransitionReference has no associated TransitionReference.Context, such as when it is default.
Throws ObjectDisposedException when you access this property after you call Context.Dispose on the context.
TransitionReference transitionRef = context.GetTransitionReference(transitionID); transitionRef.FillColor = DebugStyles.Pending;