¿Y para esto no esta la propiedad Enabled del form?
Cita:
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Empezado por Ayuda de Delphi
Use Enabled to change the availability of the control to the user. To disable a control, set Enabled to false. Disabled controls appear dimmed. If Enabled is false, the control ignores mouse, keyboard, and timer events.
To re-enable a control, set Enabled to true. The control is no longer dimmed, and the user can use the control
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