Any tips - Task Model, Who Id (Assigned To) field should render User, Partner User as pick list

@Rob Hatch, yes you are right, it works fine with standard salesforce layout.  To get you more clarity in this.  Salesforce Set Up-> Activities -> Task Fields -> Assigned To (Who Id) look up with Contact. Lead.  This is what shows in the Skuid.  To Solve this, we have used above given skuid js script to render in Assigned To field.  But it wasnt wrk.

Could you please help me.