The progress fill amount displayed on the referenced state's accent bar, expressed as a percentage.
Accepted values range from -100f to 100f. A positive value fills the bar from left to right.
A negative value fills it from right to left. A value of 0 hides the bar.
This field is an override applied on top of IState.FillAmount. The default value is 0, but it has no effect.
Call the setter to start applying the override. Call StateReference.ClearCustomization to remove the override.
Setting this property has no effect when the StateReference has no associated StateReference.Context, such as when it is default.
Throws ObjectDisposedException when you access this method after you call Context.Dispose on the context.