The Drop indication was something implemented in the older internal Drag Drop Behaviors in the TreeList, TreeView, and some other controls.
From what I have seen, most (if not all) list controls show a mouse over effect (border element) when we move mouse over a row.
Do you mean the line that is shown between the rows of a certain control? This unfortunately is an internal element of each control that cannot be easily manipulated from the outside.
Now if you just want to highlight the drop target, you can easily use the DragEnter and DragLeave to change the visual states of the target. For instance, you can easily set the state to "MouseOver" on enter, and then to "Normal" on leave.
Hope this helps!
the Telerik team
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