Using a multiselect dropdown(combo) in iggrid


I have an iggrid with a column that should have a dropdown to allow multiple selection. I tried using the 'combo' editor. It allows me to select multiple but when a go on to update another column it just displays the first of the selection and also the multiple selections are gone. I need the values to be displayed comma separated.

Could you please help me with this. I've attached a sample

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