Attaching Shapes to an Generalization Relationship
A generalization symbol automatically has two subtypes attached to it.
You can drag additional subtype boxes to the automatic connector to attach them.
The connector is a special line tool that automatically connects several shapes
in evenly spaced patterns. As shapes get close to the connector,
the outline of the moving object jumps to the closest link point,
showing where it would connect if you released it.
Releasing the mouse attaches the object to the connector at
the selected link point.
