Summary

  This class groups several Buttons together.  Then, when the
  mouse is clicked down on one of the Buttons and then dragged
  onto another before being released, the other Button will go
  "down".  This is the common behaviour for buttons in a bar
  along the top of an application.

  NB - A Button must be added to the {ButtonGroup} and the
  {Dialog} too.
  @example
  @ bg := ButtonGroup()
  @ b := TextButton()
  @ b$set_label("Okay")
  @ self$add(b)
  @ bg$add(b)

Package:

(main)

File:

buttongroup.icn

ButtonGroup(argv)

add(c)

#
  Add the given {Button} to the {ButtonGroup}.
  @param c   The {Button} to add