public DesignTimeCategoryInsertViewModel()
 {
     ViewData = new CategoryInsertViewData()
     {
         CategoryName = "John"
     };
 }
 public void InsertCategory(CategoryInsertViewData data)
 {
     Category cat = new Category()
     {
         CategoryName = data.CategoryName,
     };
     catRep.InsertAction(cat);
     context_db.SaveChanges();
     Messenger.NotifyColleagues(MessageTypes.MSG_CATEGORY_INSERTED, data);
 }