Install a subclass window procedure so the control can intercept its own messages (for example, swallowing the Enter key in a text field). Idempotent. Subclasses override processSubclassed to do the work.
See Implementation
Install a subclass window procedure so the control can intercept its own messages (for example, swallowing the Enter key in a text field). Idempotent. Subclasses override processSubclassed to do the work.