If you set the disable forecolor/backcolor when you create the form, the colors will change automaticlly at run time when the enabled property is toggled.

By the way, I went a long time doing the enable/disable the hard way. Check the setall command in help, you can change the enable (or other) properties of all the kindred objects at one time. Even if you want only 90% of the text boxes enabled, setall for 100% and then manual on the 10% is easier.