/// <summary>
 /// Clear the value of IsSelected and raise change notification.
 /// </summary>
 /// <param name="item">The ModelItem.</param>
 public static void ClearDesignTimeIsSelected(ModelItem item)
 {
     item.ClearDesignerProperty(DesignTimeIsSelectedProperty); // Note: ClearDesignerProperty etc. are extension methods declared on DesignerState
     Util.InvalidateProperty(item, MyPlatformTypes.TabItem.IsSelectedProperty);
 }
 /// <summary>
 /// Clear the value of IsSelected and raise change notification.
 /// </summary>
 /// <param name="item">The ModelItem.</param>
 public static void ClearDesignTimeIsSelected(ModelItem item)
 {
     item.ClearDesignerProperty(DesignTimeIsSelectedProperty); // Note: ClearDesignerProperty etc. are extension methods declared on DesignerState
     Util.InvalidateProperty(item, MyPlatformTypes.TabItem.IsSelectedProperty);
 }