Popup with a magnifying glass

Question

I have a page with a combo that allows multiple selections of your items.

If the user selects only one item, when closing the combo a text is displayed about the selected item. if, however, the user selects multiple items, when closing the combo the displayed text is "X chosen", where X is the number of selected items.

I know that if the user opens the combo again he can see the selected items but I want to create a button, with a magnifying glass, to be placed next to this combo which, when clicked, displays a popup with the list of selected items in the combo.

Below is the combo generator code:

<script type="text/javascript">
    $(document).ready(function () {
        /*PRODUTOS*/
        $('#produto').multiselect({
            includeSelectAllOption: false,
            nonSelectedText: '[Selecione uma opção]'
        });
    });
</script>