Hi Jin Hyeok Kim,
Excuse me for sending you the SL drag/drop. The RadGragDropManager is not available for WPF so currently there is no straightforward way of moving rows from one grid to the other. Nevertheless I have created one class called GridDragDrop that implements this functionality.
You just have to create an instance of the GridDragDrop class and pass it references to two grids. Whenever the user drags a row from one of the grids and drops it on the other the RowDropped event will ve raised, giving you the freedom to remove the row form the first grid and add it to the second one.
I am sending you a project that demonstrates the GridDragDrop class.
Hope this helps.
the Telerik team