title: Deselect all children in partially selected dynatree
body: <p>I have a hierarchical dynatreee with checboxes. Clicking on a parent checkbox of a partially selected tree FIRST selects all of its children and then toggles between selecting/deselecting all the children. How can I make that FIRST click deselects all the children instead of selecting them?</p>
  
  <p>Thx very much</p>
  
  <p>regards, dejan</p>