Hello Derek, Hello Asifmute
This is how Embarcadero Rad XE (language from which MVD flows) defines the use of the KeyPreview statement:
If KeyPreview is true, keyboard events occur on the form before they occur on the active control. (The active control is specified by the ActiveControl property.)
If KeyPreview is false, keyboard events occur only on the active control.
Navigation keys (Tab, BackTab, the arrow keys, and so on) are unaffected by KeyPreview because they do not generate keyboard events. Similarly, when a button has focus or when its Default property is true, the Enter key is unaffected by KeyPreview because it does not generate a keyboard events.
KeyPreview is false by default.
Have a good day