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>Are you adding the your subclassed textboxes to the form or the standard text boxes?

both...

In desperation I modified the vfp standard text box base class just to see if my textboxes would inherit the change...

Have I got the source of the base classes correct? I've been working on the assumption that they are the ones contained in the vfp98\ffc directory. If they are somewhere else, that would explain the non effect of the changes I made!

Harry