public UndoExtendedPropertyAction(IExtendedPropertyObject obj, string extendedPropertyName, string newValue, string oldValue, ExtendedPropertyType deletedType)
 {
     Obj              = obj;
     this.name        = extendedPropertyName;
     this.newValue    = newValue;
     this.oldValue    = oldValue;
     this.deletedType = deletedType;
 }
 internal ExtendedPropertyCollection(IExtendedPropertyObject parent)
 {
     Parent = parent;
 }