public RelayCommand(Action execute, Func <bool> canExecute)
{
if (execute == null)
{
throw new ArgumentNullException("execute is null.");
}
this.execute = execute;
this.canExecute = canExecute;
this.RaiseCanExecuteChangedAction = RaiseCanExecuteChanged;
SimpleCommandManager.AddRaiseCanExecuteChangedAction(ref RaiseCanExecuteChangedAction);
}
