change-children

Makes arbitrary changes to the panel's list of children and updates the display.

• (send a-mred:panel change-children f) -> void
      f : a function which takes a list of children and returns a list of children.

  Examines the result of applying f to the current list of children. If all members of this list have this panel as their parent, sets the list of children to this list and forces a redraw. Otherwise, signals an error. Executes (send child show #t) for all children added and (send child show #f) for all children removed. Calls force-redraw to reflow the displayed controls.