add-child

Adds a child to the end of the list of children and updates the display. This is called automatically by all of the children's constructors.

• (send a-mred:panel add-child new-child) -> void
      new-child : an instance of a children class (see mred:panel%)

  Adds new-child to the list of children (via change-children ), unless new-child's parent is not this panel, in which case it signals an error. Executes (send new-child show #t).