Hi,

selectedValues expects strings/numbers, not objects. The items of the DropDownList/ComboBox can be strings or objects with label/value fields. The values are always strings or numbers. I would suggest you to look at https://www.htmlelements.com/demos/grid/editing-cascading/. The example shows how to create such an editor.

Best regards,
Peter Stoev

Smart UI Team
https://www.htmlelements.com/