gistfile1.cs

    public class DateTimeMaskController : ViewController<DetailView>
    {
        protected override void OnViewControlsCreated()
        {
            base.OnViewControlsCreated();
            foreach (var viewItem in View.Items)
            {
                ASPxDateTimePropertyEditor editor = viewItem as ASPxDateTimePropertyEditor;
                if (editor != null)
                    editor.ControlCreated += (s, e) =>
                        {
                            ASPxDateTimePropertyEditor dateTimePropertyEditor = (ASPxDateTimePropertyEditor) s;
                            dateTimePropertyEditor.Editor.UseMaskBehavior = true;
                        };

            }
        }

    }