populate AWS_CHOICES values into LC workbench process route names

Hi All,

Sometimes we want to give your users a choice, which will affect the routes  that are taken within the LiveCycle process. If we put a bit of text into the  AWS_CHOICE text field, such as “Approve,Deny”,   .you can see the screenshot .now my problem is i need to populate AWS_CHOICES values into LiveCycle workbench process route names  .

I am following the suggestions given in the url http://www.avoka.com/blog/?cat=11.

in the section Giving the user a choice

i was unable to find the  checkbox that says “Populate Form with Routes when Assign task activity.

Any response will great appriciation.