Changing Position of Item in Editable Grid

 If any of you have seen the functionality in User Start Pages, I want to implement the functionality to move a line of the editable grid up or down. I think I can do it via a dynamic link but it seems like possibly an expression rule may be an easier way? I looked around for examples and recipes and was not able to see any. 

Anyone have any guidance on this? Any resources I could use to find an example for next steps? 

Thanks!

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