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    Group
      Finish and close the active CAD-function with the Esc-key.

      All objects of the group will be hilited.
      The number of objects in the group is displayed
        in the upper left corner as "Group #".

    create group:

      add single object to group:
       press left mousebutton (and keep pressed);
         if only one object under cursor, no menu appears - release mousebutton;
         else select one of the objects (subObjects) of the menu and release mousebutton;
       selecting this object again removes it from group.

      Select a group of objects with the mouse:
        press the Ctrl-key and the left mousebutton, keep it pressed
          and drag the mouse.
        All objects inside the rectangle will be included in the group.
        Select additional objects to add to group ,
        select objects again to remove from group.

      Add all existing objects to group:
        Ctrl-A-key                                          or
        Menu Group / "add all objects to group"
        put all objects into group

    modify group:
      add single objects to group:
        select object with left mousebutton

      remove single objects from group:
        select object with left mousebutton again

      remove all objects of certain type from group:
        select one object with the right mousebutton, select option
        "remove all of this type from group"

      remove all objects of other types from group:
        select one object with the right mousebutton, select option
        "remove all other types from group"

    use group:
      Activate functions with the right mousebutton;
      if no object needs to be selected, press the Ctrl-key in addition.

      hide all objects of group:
        Right mousebutton or menu Group: "hide group"
       -objects in group will not be displayed -

        Redisplay this objects: select checkbox "View" in the mainToolbar;
          select objects to display (all: Ctrl-A)

      delete all objects of group:
        Delete-key                                        or
        Right mousebutton or menu Group: "delete group"

        All depending objects also will be deleted!

      save all objects of group into modelfile:
        outputformat is native (.gcad)
        Menu Group / "save group -> File"

      list all objects of group:
        Menu "Dump" / "Group"

    clear group:
        Esc-key                                          or
        Right mousebutton or menu Group: "clear group"
      - Deactivates group.

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