Kendo UI grid popup edit custom template - Add a multi-select control

Kendo UI grid popup edit custom template - Add a multi-select control

I'm using custom popup editor template for the edit popup option of the grid:
editable: { mode: "popup",
template: $("#popup_editor").html()
},
<!-- popup editor template -->
<script id="popup_editor" type="text/x-kendo-template">
template
</script>
There requirements for the template have a few multi-select controls that
are not in the grid, the summary of what the user selects in these
multi-select controls is what determines a "summary" field in the grid.
Ex:
(multi-select1) color: red, blue, purple --- not a field in grid
(multi-select2) size: xs, s --- not a field in grid
Summary: color="red, blue, purple" ; size="xs, s" --- field shown in grid
Question is: how can i add the multi-select in the edit popup custom
template?