Hola,
La solución pasa por utilizar los eventos "OnKeyUp" u "OnKeyDown". La explicación en la ayuda del evento "OnKeyPress":
Cita:
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Empezado por Ayuda de Delphi
Use the OnKeyPress event handler to make something happen as a result of a single character key press.
The Key parameter in the OnKeyPress event handler is of type Char; therefore, the OnKeyPress event registers the ASCII character of the key pressed. Keys that don't correspond to an ASCII Char value (Shift or F1, for example) don't generate an OnKeyPress event. Key combinations (such as Shift+A), generate only one OnKeyPress event (for this example, Shift+A results in a Key value of “A” if Caps Lock is off). To respond to non-ASCII keys or key combinations, use the OnKeyDown or OnKeyUp event handlers.
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