About this task
Note: Activity, state machine, communication, and sequence diagrams
cannot be set as the default diagram for a package because these diagrams
are added as children of their respective model elements. For example, when
you create an activity diagram, it is added to the model element, not the
package. When you right-click one of these diagram types in the
Project
Explorer view and click
Make Default Diagram,
the selected diagram becomes the default diagram for the model element that
contains the diagram. You can open the default diagram by double-clicking
the model element in the Project Explorer view.
Similarly, if a class, use
case, or other type of diagram is nested under a model element other than
a package, you can make it the default diagram of the model element. If you
want to make the diagram the default diagram for the package, you must move
it directly under the package in the Project Explorer view.