Simply add this module to your project and add one line of code to your App's Open event. It provides total control of Undo's with the CustomUndo Interface and various methods and properties. It's cross-platform compatible and allows for easy creation of Listboxes with Rowtags or Celltags using Dictionaries of Arrays of Pictures.
The 1.1.0 version of TheBigUndo for Mac is available as a free download on our software library. TheBigUndo for Mac lies within Developer Tools, more precisely IDE. This software for Mac OS X is a product of piDog. Our built-in antivirus checked this Mac download and rated it as 100% safe. The most recent installation package that can be downloaded is 208 KB in size.
From the developer:
For users of Xojo, implementing a reliable Undo feature has never been a simple task, but with the introduction of TheBigUndo module by piDog Software, Undo's are almost an afterthought. heBigUndo can be as easy to use as copying the Module to your project and adding one line of code to your App's Open event.
You may want to check out more software for Mac, such as Objective Basic or Epsilon, which might be similar to TheBigUndo.