How to tie a gridview row edit properly

I have a Gridview that has many pages. I order it by an ID number in descending order which is displayed. When I try to edit the row with my image button, the index I get does not match the row I clicked Edit on. How do I tie the row I clicked Edit on to the index the gvRowEditing method recieves? It gets a GridViewEditEventArgs object but that does not have a Command Argument that can tie the row to.
 
Thanks!