If you're in the middle of refactoring and find something that needs to be done, but you're not quite ready to tackle it yet, here's a nice way to make sure you don't forget.

#If DebugBuild
  #Pragma Warning "This isn't implemented yet"
  #Pragma Error "This isn't implemented yet"

You can of course add comments or anything else you need to help you remember. And the message can be anything you like. The point is this will show the message in Xojo's analyzer (which you should be using) but still allow you to run and debug the project. But if you try to build, you'll get stopped. This way you won't accidentally ship a build to your customers that has missing functionality.