Dynamic Groups
==============

   In the same way you can add windows to an application after its
creation, you can add elements to already existing group objects. This
may be useful if a group contains many similar children or if the
number of children is not known in the beginning.

   You can add new elements to groups or delete them again, but the
window that contains this group must not be open!

A small example:

         app = ApplicationObject,
             ...,
             SubWindow, win = WindowObject,
                 WindowContents, VGroup,
                     ...,
                     grp = VGroup,
                 End,
                 ...,
             End,
         End,
     End;
     
     /* The group 'grp' has been created without any children. */
     /* The window must not be opened now!                     */
     
     for (i=0; i



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