1. In a graphical modeling environment, a method of graphically performing structural templatization, comprising: displaying a graphical model with a plurality of components; instantiating an instance of an interface component into the graphical model, the instance of the interface component including model connection information and a subsystem component having undefined functionality; instantiating an instance of an implementation component into the graphical model, the instance of the implementation component including model functional content; and connecting graphically in the displayed model the instance of the interface component and the instance of the implementation component, the connection information of the instance of the interface component programmatically merging with the model functional content of the instance of the implementation component as a result of, and following, the graphical connection of the instance of the interface component and the instance of the implementation component, wherein the merging replaces the undefined functionality of the subsystem component in the interface component with the model functional content of the implementation component.