First, if you, or your company, purchased the expensive DevExpress suite/grid: they have excellent technical support. Here's a specific example related to grid undo: [
^].
CP has many articles on strategies for undo/redo; just search the site.
Come back with specific questions, and code relevant to those questions. It is very unlikely anyone here will download a .rar file containing 3rd. party code you don't know how to use ... security risk.