 existing node, a new link is also drawn from
    that existing node to the newly dropped node. If a drop happens on an existing link, the link is
    reconnected to go to the newly dropped node, and a new link is added to go from that newly
    dropped node to whatever node the link had been connected to before.
  </p>
  <p>
    This sample also demonstrates allowing external clipboard pasting, by modifying
    <code>myDiagram.commandHandler.doKeyDown</code> to do nothing but allow the event to bubble, and