public String toString(){
  String out=name;
  if (id != null)   out+=" id=" + id;
  if (on_click != null)   out+=" onClick=" + on_click;
  return out + " " + children;
}

public String toString ( ) { String out = name ; if ( id != null ) out += " id=" + id ; if ( on_click != null ) out += " onClick=" + on_click ; return out + " " + children ; }
are we interested in onclick only ? ? ?
