How can I make arrow keys work in a locked grid

[PxPlus]

By default the PxPlus GRID will skip locked cells when responding to the arrow keys on the keyboard.  This provides for easier/faster data entry.

If however you want to allow the user to enter locked cells by using the arrow keys you need to turn off the 'SkipLockedCells property for the GRID.

See SkipLockedCells property for details.