*UPDATE* The bug was related to the old version of CakePHP used, because _viewVars got deprecated.
*ORIGINAL*
After trying to use it I've noticed, that $hashkey get's properly set in the component, but does not propagate to the helper. Don't know the suposed way of how it should be done, so just copied the same code to the helper as a class member.
*ORIGINAL*
After trying to use it I've noticed, that $hashkey get's properly set in the component, but does not propagate to the helper. Don't know the suposed way of how it should be done, so just copied the same code to the helper as a class member.