A mirrored drawing is created when you mirror a part with a drawing. And I think the drawing must have the same name as the part (example: part.prt, part.drw). The mirroring, however, needs to be done by choosing Mirror with features, otherwise the drawing loses the views. If you choose Mirror geometry only the drawing views are not the same as in the original drawing. I think this is a bug... or it is in the name: mirror with features, and you get all the features.
I am using Creo Parametric 2.0 M120 and create the mirrored part via
