Rather than simply using the drag and drop method to reorder rows within a rad grid, allow for the built in functionality where you can simply move rows up and down client side so that the user can sort the data by rows rather than columns.

Feature request came after a customer had a grid of data that was sorted in a sorted order but they wanted the ability to not only select what rows they wanted which we coded using the checkbox column, but they then wanted to be able to sort the rows they had selected as the selected rows were being exported to a PDF or Excel so wanted them in a certain order.