public class CommandTriggerAction : TriggerAction<UIElement>
    {
        #region Command Property

        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.Register(
                "Command",
                typeof(ICommand),
                typeof(CommandTriggerAction)
            );

        public ICommand Command
        {
            get { return (ICommand)GetValue(CommandProperty); }
            set { SetValue(CommandProperty, value); }
        }

        #endregion

        #region CommandParameter Property

        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.Register(
                "CommandParameter",
                typeof(object),
                typeof(CommandTriggerAction)
            );

        public object CommandParameter
        {
            get { return (object)GetValue(CommandParameterProperty); }
            set { SetValue(CommandParameterProperty, value); }
        }

        #endregion

        protected override void Invoke(object parameter)
        {
            if (Command != null)
                Command.TryExecute(CommandParameter ?? parameter);
        }
    }

    public static class CommandHelper
    {
        public static bool TryExecute(this ICommand command, object parameter)
        {
            if (command.CanExecute(parameter))
            {
                command.Execute(parameter);
                return true;
            }
            return false;
        }
    }