<Grid
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <TextBlock Text="{Binding State}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>

public enum EnumState
{
    First,
    Second,
    Third
}

public class EnumViewModel
{
    public EnumState State { get; set; }
}

public class EnumDisplayBehavior : MonoBehaviour
{
    void Start()
    {
        NoesisView view = GetComponent<NoesisView>();
        view.Content.DataContext = new EnumViewModel { State = EnumState.Second };
    }
}