Moving Between Hierarchy Levels
Do one of the following:
Double-click a hierarchy state
Right-click the hierarchy state and select Next Level from the context menu.
You move one level down, i.e. the state diagram contained inside the hierarchy state is shown. Here, you can specify the content of the hierarchy state.
While inside a hierarchy state, double-click in the drawing area (not on a diagram item).
You are moved back up one level.