I think maybe you misunderstood. I understand, that I can define values in parameter list. But I don’t want to define as I don’t know which picture (from which library) want to be used by the user.
So I found this “gs_picture_name” parameter name (STR type), which results that the parameter values already change for only picture formats from added libraries. I only want to use more parameter like this.
for example I want create a double screens for a PC workstation and the double screen is one object. I would like that user has the option which picture he or she want to see on which screen. And the user could choose from all added library.