title: How pass control-param to the picker in alfresco 5?
body: <p><strong>The problem</strong></p>
  
  <p><a href="https://stackoverflow.com/a/34872521/1251549">Here</a> is the answer about extending default <code>authority.ftl</code> in alfresco. But when <code>pickerchildren.get.js</code> is invoked it has null instead of <code>argsFilterString</code>. Also code sources <code>pickerchildren.get.js</code> differes from sources in the answer.</p>
  
  <p><strong>About degugging</strong></p>
  
  <p>I have aready modified <code>authority.ftl</code> to output expression <code>${field.control.params.filterString}</code> into html, so this paramer is <strong>not</strong> null and works as expected.</p>
  
  <p>What I really can not understand is <code>pickerchildren.get.js</code>, the line <code>argsFilterString = args['filterString']</code> always return null. Also there is no special parameters in <code>args</code> variable.</p>
  
  <p>So how to pass new controll-param to alfresco picker when alfresco version is 5?</p>