New Post: How to separate commands into separate classes for a large viewmodel?

Thanks, I was thinking about going it that way. We host an editor control with a bunch of formatting commands, for instance, so I'll create a separate viewmodel for the "active editor".

Out of curiosity, is there a reason MVVM Light uses RelayCommand rather than a subclassable ICommand? I mean, that lambda syntax is super-convenient, but why no CommandBase for "heavier" commands? Is it just that it's never been needed (using modular viewmodels) or is there some technical reason?