Many objects (packages, processes, classes, activities, states, EAM objects, etc.) have the capability to display sub-objects within their symbols through one or more composite view modes. Depending on the type of object, the sub-objects can be displayed either as a static sub-diagram within the symbol or as dynamically editable symbols that you can create and arrange directly from the parent diagram.
To toggle between the different composite view modes, right-click a symbol and select Composite View and then one of the following commands:
For information about the specific objects supporting composite view, see the appropriate modeling guide.