To make use of this attribute it's necessary to inherit a category from Unique foundation class-initializer or utilize a static helper process: MaartenMaarten 23k33 gold badges5151 silver badges6969 bronze badges Insert a remark I might stay away from incorporating a default to your constructor; leave that for dynamic assignments and https://share.evernote.com/note/43eadfc3-aa01-b647-c36d-ca7aa905465d