This paper presents the utilization of UML (Unified Modeling Language) state diagrams and activity diagrams in order to model a discrete control system for a virtual reality (VR) application. Discrete control systems are utilized to control the behavior of a virtual model within a VR application. The common approach is to use a graphical notation, whose graphical elements represent states and messages. However, in a technical domain the discrete event system has to integrate technical simulations and engineering models. Furthermore, it needs to be flexible. An UML-based notation facilitates both. Changes are simple by replacing states and transitions of the diagrams. Engineering models are integrated by code templates, which are derived from the UML. This UML-bases notation has been tested. In summary, utilizing UML simplifies to keep track of the behavior models of virtual objects.