Custom property for selecting Visitor Groups

using EPiServer.Personalization.VisitorGroups;

namespace MySite.Website.Plugins.SpecializedProperties.VisitorGroups

{

    [PageDefinitionTypePlugIn(DisplayName = "Visitor Group selection")]

    public class PropertyVisitorGroups : PropertyMultipleValue

    {

        public override IPropertyControl CreatePropertyControl()

        {

            return new PropertyVisitorGroupsControl();

        }

    }

    public class PropertyVisitorGroupsControl : PropertySelectMultipleControlBase

    {

        protected override void SetupEditControls()

        {

            var repository = new VisitorGroupStore(DynamicDataStoreFactory.Instance);

            var list = repository.List()

                .OrderBy(v => v.Name)

                .Select(v => new ListItem(v.Name, v.Id.ToString())

                        {

                            Selected = ((PropertyMultipleValue) PropertyData).IsValueActive(v.Id.ToString())

                        })

                .ToArray();

            EditControl.Items.AddRange(list);

        }

    }

}