I'm trying to implement the custom Drag Drop behavior depicted at this link: https://docs.telerik.com/devtools/wpf/controls/radtaskboard/features/taskboardcolumndragdropbehavior#taskboardcolumndragdropbehavior
However I cannot get the XAML to recognize this item
<
telerik:RadTaskBoard.DragDropBehavior
>
The error message is 'The member "DragDropBehavior" is not recognized or is not accessible.
Regards,