Get reference to drop down in Coral UI without duplicates

Hi experts,

Can anyone help me to figure this out. I have drop down in touch ui and populating some values via datasource.

Now when adding listeners to it, how can I get reference to this field.

I used

 var list= new CUI.Select({
            element: $("[name=./list']").closest(".coral-Select")
  });
 But this does add duplicate values to drop down.

In order to remove  duplicates I tried to use: list._selectList.children().not("[role='option']").remove();  but it didnt worked. Still duplicates are present.

Share your thoughts guys....