gistfile1.txt

// Not written in an IDE
class MyViewModel
{
   MyViewModelStepEnum CurrentStep { get; set; }

   enum    MyViewModelStepEnum {
        Step 1, Step2
   }
}


XAML:

<Window.Resources>
   <local:EnumToVisibilityConverter x:Key="CurrentStepConverter" EnumType="{x:Type local:MyViewModelStepEnum}">
</Window.Resources>

<Grid Visibility="{Binding CurrentStep, Converter={StaticResource CurrentStepConverter}, ConverterParameter=Step2}" />


Converter:
public class EnumToVisibilityConverter : IValueConverter
{

     public Type EnumType { get; set; }

     public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
     {
            if(parameter == null)
                    // throw

            var parameterValue = Enum.Parse(EnumType, parameter);
            return value == parameterValue ? Visibility.Visible : Visiblity.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }
}