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Depending on the ActiveView, RadScheduler creates a different element which could be SchedulerDayViewElement, SchedulerMonthViewElement, SchedulerTimelineViewElement, or SchedulerMultiDayViewElement. When you have enabled the grouping mode, RadScheduler can create a SchedulerDayViewGroupedByResourceElement, SchedulerMonthViewGroupedByResourceElement or SchedulerTimelineViewGroupingByResourcesElement. When you implement a custom drag and drop functionality, you need to get the instance of the ViewElement and cast it to the proper element.
In your scenario, if you implement a drag and drop and your ActiveView is Timline, you need to use the SchedulerTimelineViewElement. If you have resources and your ActiveView is Timeline, you need to use the SchedulerTimelineViewGroupingByResourcesElement. The last has a method called GetTimelineElements which will give you the collection of the TimelineViewElements which are part of the SchedulerTimelineViewGroupingByResourcesElement.
If you have additional questions, we will be happy to help you.
the Telerik team
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