Module Dependency Tree

                             + <-- Transition
                             |
         + <-- Animation <-- + <----------+ <-- DragAndDrop
         |                                |
 Node <--+ <-- Container <--+ <-- Stage --+ 
         |                  |
         + <-- Shape        + <-- Layer
                            |
                            + <-- Group

Verbose version

• Shape depends on Node
• Group depends on Container which depends on Node
• Layer depends on Container which depends on Node
• DragAndDrop depends on Animation which depends on Node
• Transition depends on Animation which depends on Node
• All shapes, including Rect, Circle, Text, etc., depend on Shape which depends on Node