area<%>

        _____________________|_______________

        |               |                   |

      subarea<%>     window<%>       area-container<%>      

<<<____|____       _____|__________       __|___  ___________________<<<

            |      |              |       |    |  |                  

           subwindow<%>           |       |    |  |                  

<<<______________|___________     |       |    |  |                 _<<<

            |               |     |       |    pane%                |

       control<%>           |     |       |     |- horizontal-pane% |

        |- message%         |     |       |     |- vertical-pane%   |

        |- button%          |     |       |                         |

        |- check-box%       |  area-container-window<%>             |

        |- slider%          |        |                              |

        |- gauge%           |        |            __________________|

        |- text-field%      |        |            |   

            |- combo-field% |        |-------- panel%       

        |- radio-box%       |        |          |- horizontal-panel%

        |- list-control<%>  |        |          |- vertical-panel%

            |- choice%      |        |              |- tab-panel%

            |- list-box%    |        |              |- group-box-panel%

                            |        |

                            |        |- top-level-window<%>

                            |            |- frame% 

                         canvas<%>       |- dialog%

                          |- canvas%

                          |- editor-canvas%

    menu-item<%>                menu-item-container<%> 

        |                              | 

        |- separator-menu-item%   _____|___ 

        |- labelled-menu-item<%>  |       |- menu-bar% 

            _________|_________   |       |- popup-menu% 

            |                 |   | 

            |                 menu%

            |                          

            |- selectable-menu-item<%>               

                |- menu-item%                        

                |- checkable-menu-item%

       event%                                 timer%

        |- key-event%                         cursor%

        |- mouse-event%                    

        |- scroll-event%                      clipboard<%>

        |- control-event%                     clipboard-client%

    3.1 area<%>

    3.2 area-container<%>

    3.3 area-container-window<%>

    3.4 button%

    3.5 canvas<%>

    3.6 canvas%

    3.7 check-box%

    3.8 checkable-menu-item%

    3.9 choice%

    3.10 clipboard-client%

    3.11 clipboard<%>

    3.12 combo-field%

    3.13 control<%>

    3.14 column-control-event%

    3.15 control-event%

    3.16 cursor%

    3.17 dialog%

    3.18 event%

    3.19 frame%

    3.20 gauge%

    3.21 group-box-panel%

    3.22 grow-box-spacer-pane%

    3.23 horizontal-pane%

    3.24 horizontal-panel%

    3.25 key-event%

    3.26 labelled-menu-item<%>

    3.27 list-box%

    3.28 list-control<%>

    3.29 menu%

    3.30 menu-bar%

    3.31 menu-item<%>

    3.32 menu-item%

    3.33 menu-item-container<%>

    3.34 message%

    3.35 mouse-event%

    3.36 pane%

    3.37 panel%

    3.38 popup-menu%

    3.39 printer-dc%

    3.40 radio-box%

    3.41 selectable-menu-item<%>

    3.42 separator-menu-item%

    3.43 scroll-event%

    3.44 slider%

    3.45 subarea<%>

    3.46 subwindow<%>

    3.47 tab-panel%

    3.48 text-field%

    3.49 timer%

    3.50 top-level-window<%>

    3.51 vertical-pane%

    3.52 vertical-panel%

    3.53 window<%>