Разработка элемента управления для Конструктора разметок

public partial class RealPropertyControl : XtraUserControl, IPropertyControl
{
 private IStaffService staffService; (1)

 public RealPropertyControl()
 {
  this.InitializeComponent();
 }

(2)

 public bool Hierarchy (3)
 {
  get;
  set;
 }

 public void LoadData() (4)
 {
  if (ObjectContext = null) return; (5)

  staffService = ObjectContext.GetService<IStaffService>();
  ComboBoxItemCollection coll = staffBox.Properties.Items;

  coll.BeginUpdate();
  foreach (var item in staffService.GetUnits(null, true, Hierarchy))
  {
   coll.Add(new StaffBoxItem(ObjectContext.GetObjectRef(item).Id, item.Name));
  }
  coll.EndUpdate();
 }

 private void staffBox_SelectedIndexChanged(object sender, EventArgs e) (6)
 {
  if (staffBox.SelectedIndex = -1) ControlValue = null;
   else ControlValue = (staffBox.SelectedItem as StaffBoxItem).Id;
  ControlValueChanged(this, e);
 }
}

public class RealLayoutItem : FixedLayoutControlItem<RealPropertyControl>
{
 private bool hierarchy;

 public override string ItemTypeName (1)
 {
  get
  {
   return "Собственный элемент управления";
  }
 }

 public override System.Drawing.Image CustomizationImage (2)
 {
  get
  {
   return SampleControl.Properties.Resources.ButtonIcon.ToBitmap();
  }
 }

 public override LayoutsPropertyType PropertyType (3)
 {
  get { return LayoutsPropertyType.DepartmentReference; } (4)
 }

 public override FieldType[] GetSupportedFieldTypes() (5)
 {
  return new FieldType[]
  {
   FieldType.RefId (6)
  };
 }

 public override Control Control (7)
 {
  get
  {
   return base.Control;
  }
  set
  {
   base.Control = value;
   if (value != null)
   {
    this.PropertyControl.Hierarchy = hierarchy;
   }
  }
 }

 [XtraSerializableProperty] (8)
 public bool Hierarchy
 {
  get
  {
   if (base.PropertyControl != null)
    return base.PropertyControl.Hierarchy;
   return hierarchy;
  }
  set
  {
   if (this.PropertyControl != null)
    this.PropertyControl.Hierarchy = value;
   hierarchy = value;
  }
 }
}

public class RealWrapper : SpecialPropertyWrapper<RealLayoutItem>
{
 [Category("Дополнительные настройки"), DisplayName("Все подразделения"), Description("Выводить все подразделения или только первый уровень")]
 [TypeConverter(typeof(BooleanTypeConverter))]
 public bool Hierarchy
 {
  get {
   return this.Item.Hierarchy;
  }
  set
  {
   this.Item.Hierarchy = value;
  }
 }
}