InactiveItemsOpacity: Number;
The InactiveItemsOpacity property contains transparency coefficient for inactive bubble chart bubbles.
Use JSON or the setInactiveItemsOpacity method to set the property value and the getInactiveItemsOpacity method to get the property value.
The property value varies between 0 and 1, where 0 corresponds to an absolutely transparent bubble, and 1 to an opaque bubble.
This property is under development.