I have used this sample to add a combo selection into the grid. This works great so far.

http://ko.infragistics.com/products/jquery/sample/combo-box/grid-editor

Now I want to change the Combo Box to allow multi selection of items I'm succeded with data with the following setting in Razor.

     .ComboEditorOptions(options =>
                        {
                            options.DataSource(ViewData["comboDataSource"]);

                            options.MultiSelection(iComboMultiSelection.OnWithCheckboxes); 
                        });

The only problem I have is that currently I only get one value back when I select several items. Can you give me a pointer where to look.

Thanks in advance