c# - Can't bind to model value -

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I can not see how to insert a drop down list for values ​​in the model.

Assume that my strongly typed model is type fa.domain.text.account .

account has a PersonId field, I want to pair it in a select drop down list. When the scene is displayed, I want to reflect the value of @ Model.PersonId .

My code is as follows:

Select the tag:

I tested some things, 

  function object (PersonId , NamePP) {this.CostCentreId = ko.observable (PersonId); This.NamePP = ko.observable (NamePP); }   
 should be:  
  function object (PersonId, NamePP) {this.PersonId = ko.observable (PersonId); This.NamePP = ko.observable (NamePP); }

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