If the UI component embedded into the DropDownBox allows multiple selection, synchronize the DropDownBox value with the selected items. Synchronization instructions are the same for every selection mode.
In this demo, the DataGrid's selection.mode and TreeView's selectionMode properties are used to enable multiple selection.
Thank you for your interest in our ASP.NET MVC product libraries and UI component suite.
We are moving ASP.NET MVC-related demos and content to DevExpress.com.
Please make sure to update your bookmarks with our new URL.