setValue for Multi-Select

System

Based on a specific selection from a select dropdown box, values from one multi-select dropdown populate
to another multi-select dropdown. It is within a replicant so I'm looping through the items.
However, I can't get the items in the multi-select dropdown to highlight when I use setValue.


Item that I need to copy from (this is a multi-select dropdown):

var Item = IWDatacapture.getItem("/MetaData/PermissionGroup[" + i + "]/AffiliatesGroup"); //multi-select item
var Idx = Item.getValue();

I am copying to:

var Item1 = IWDatacapture.getItem("/MetaData/AudienceGroup[" + i + "]/AffiliatesGroup"); //multi-select item
var Idx1 = Item1.getValue();


Item1.setValue([Idx]); //when these values are set, should they display highlighted in the dropdown?


There is much more code, however, I was mainly wondering if setValue on a multi-select box should
highlight the values being set.