Ctreeview Show Child On Node Click

hey there

im using yii ctreeview extension and it isnt possible for me to expand/collapse the node on node click - only with +/-. have anyone an idea whats going wrong?

e.g.


- root

  + child1

  - child2

    +child3

It should collapse when im clicking on root and it should expands when im clicking on child1.

cheers