You can only add a property to a text box class, not an instance of a textbox. Just create the class and add the property then add an instance of your class to your form.
>It is easy to visually add a property or method to a form (Form/New Property) or to a class (Class/New Method).
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>My VFP Bible (Using VFP 5 by Michael Antonovich) indicates that you can add properties and methods to controls and forms. It shows an example for a form but not for a control. The book has examples where a method is added in code with: PROCEDURE - END PROCEDURE.
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>I would like to be able to add a method to a textbox control visually. Can this be done? How?