Delegation Link in a custom Form

Hi,

we recently installed Nintex Forms to make user friendly Form for our Nintex Workflows.

But i ran into one Problem.

When using the Standard "Request Data" Form, there is the "Or you can delegate this task to another perspon." text, when clicking delegate i can delegate the task

After editing the Form with Nintext Forms, this "delegation"-link is gone.

Is there a Form Control or some easy way to get this link in my custom form, that i'm missing?