I have a situation where the user is entering employee numbers in a text box. If the data is valid, cursor advances to next object. If data is invalid, focus stays in the original text box. I have a button on the screen to allow the user to add new employees to the table. If they have entered and invalid employee number in the field, and then click the add button, the data is still in error and the valid event is processed on the text box. They have to clear the data before clicking the add button.

I temporarily caused the invalid processing on the text box to clear the value, but it would be better to allow the user to see the data they had entered. Add a new user, that user, and then have the data to be valid.