The Multi-select control enables you to add drop-down list with multiple selection in your application. The control can bound to a collection of custom objects or simple strings, which will show in the dropdown. It uses CheckedMemberPath property, which controls the check boxes corresponding to each ListBox item.
The control has a fully customizable header which, by default, displays upto two items selected from the list. If more than two items are selected from the list, then the header displays the count of selected items. However, you can control this default behavior to- adjust the maximum number of selected items to display in header (MaxHeaderItems), customize the message to be displayed when no items are selected, and set the format string to show the item count (HeaderFormatter).