Changing the default Document Type

[JohnFol]

Afternoon all.
I have created a few Use Case diagrams and for each use case I'd like to be able to drill down into the activities that make up the use case. For example I have a use case called "Make Tea" and I make it a composite element. I should be able to double click the UC and have an Activity Diagram open up showing the steps needed to make a cup of tea.
I am sure this is how a previous project used EA, but for the life of me I can't find out how to do it.
I have experimented with _defaultDiagramType but with no success.

Any suggestions?

[Paul Lotz]

Put the activity diagram directly beneath the use case diagram in the project browser (and no other diagram), then click on the use case element and choose Advanced...Make Composite.  This will create the linking you want.  (You can move the activity diagram elsewhere at this point if you want.)

[JohnFol]

Paul, that's perfect.

Many thanks!