Documentation:OCLOperators ExecuteAction

Executes the action in a ViewModel.

selfVM.ExecuteAction(<nameofNesting in viewmodel>,<Name of action>) 

The action is executed disregarding disable/visible expression. Thus, when you do this from code, you must ensure any enable rules yourself (this is a good thing because sometimes you may want to do one thing from code and another from the UI or ServerSide execution).