e>ClientBehavior</code></a> source.  ClientBehavior implementations that submit back
 to the Faces lifecycle are required to identify which component
 triggered the ClientBehavior-initiated request via the
 <code>javax.faces.source</code> request parameter.  In
 most cases, th source id can be trivially derived from the element
 to which the behavior's client-side script is attached - ie. the
 source id is typically the id of this element.  However, in components
 which produce more complex content, the beh