I've created a sample project which demonstrates how you can implement drag and drop between the "Rooms" listbox and the ScheduleView based on the provided description.
Note that you can drag and drop only appointments over the ScheduleView, that's why I've added two classes which inherit Appointment:
class - the real appointments of the ScheduleView. ( more information about custom appointments can be found here
class - the items of the second "Rooms" listbox are converted to this type in order to distinguish them in CanDrop and Drop methods.
Also I used CustomListBoxDragDropBehavior
class which overrides DragDropCompleted method in order to prevent the removal of the item from the listbox.
Please download the attachment and give it a try.
the Telerik team
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