Returns a property value of active multi-choice value during an iteration of parameters and multi-choice values of a configuration. Properties of reference type can be followed to instead return a property of the referenced object. If current parameter isn't a multi-choice parameter or if no matching property is found, then an empty string is returned.
string ActiveParamValue(string propertyName; [string propertyName2]; ...)
| propertyName | The name of a property to read. | 
| propertyName2 | Optional name of a property to read from an object that is referenced by the first property. | 
Example
ActiveParameter("Class") = "MultiChoiceParam" ? ActiveParamValue("Title") : ActiveParameter("Title")
If current parameter is a multi-choice parameter, then the title of current multi-choice value is returned else the title of current parameter is returned.
