A reusable identifier for an event callback argument of type TArg.
Additional resources: UIElements.EventCallbackInternal.Create
| Method | Description |
|---|---|
| Register | Sets a value for the provided element for this argument identifier. That value can then be retrieved by callbacks that have a second argument of the same type. |
| Unregister | Removes the value for the provided element for this argument identifier. Until a new value is set, a value can no longer be retrieved by callbacks that have a second argument of the same type. |