+--------------+
        | DisplayPanel |
        +--------------+
               / \   
               ---          
                |
   +---------------------------+
   | BalloonControl            |
   +---------------------------+
+--| BalloonInputView bView    |
|  | Balloon b                 |---------+
|  | BufferredPanel window     |---+     |
|  | JPTCanvas theCanvas       |-+ |     |
|  | SimpleAction paintAction  | | |     v
|  | SimpleAction newAction    | | |  +------------+
|  | SimpleAction cancelAction | | |  | Balloon    |
|  +---------------------------+ | |  +------------+
|  | void paintAction()        | | |  | int x      |
|  | void paintAction()        | | |  | int y      |
|  | void cancelAction()       | | |  | int radius |
|  +---------------------------+ | |  | Color c    |
|                      +---------+ |  +------------+
|                      v           v
|    +-----------------------+   +---------------+
|    | JPTCanvas             |   | BufferedPanel |
|    +-----------------------+   +---------------+
|    | BufferredPanel window |
|    +-----------------------+
|
|  +-------------------------------------+
|  | interface: BalloonInput             |
|  +-------------------------------------+
|  | Balloon demandBalloon()             |
|  | Balloon requestBalloon()            |
|  |           throws CancelledException |
|  +-------------------------------------+
|                  / \
|                   |
|          +- - - - - - - - - - - - - - - - -+
|          |                                 |
|  +-----------------------+     +---------------------+
|  | GUIBalloonInput       |     | ConsoleBalloonInput |
|  +-----------------------+     +---------------------+
|  | BalloonInputView bGUI |--+  +---------------------+
|  +-----------------------+  |      +---------+
|                             |      | Display |
|                             |      +---------+
+---------------------+       |           / \ 
                      |       |           ---
                      v       v            |
                   +----------------------------+
                   | BalloonInputView           |
                   +----------------------------+
                   | TextFieldView   xTFV       |
                   | TextFieldView   yTFV       |
                   | SliderView   rSlider       |
                   | ColorView      cVieW       |
                   +----------------------------+                   
                   | TablePanel createDisplay() |
                   +----------------------------+