I already answered to this query in support ticket #816306. I will post my reply here as well, in case anyone else stumbles on the same scenario:
Although this behavior is not supported out of the box it could be achieved using a custom solution. For example:
Here is an example illustrating the above approach - I hope it helps.
- Subscribe to the MultiSelect's open event
- Once the event is triggered get the instance of the popup list
- Find all li elements and set their display CSS attribute to its default value (selected items' display is set to none by the widget)
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