Okay, okay, so, the user can determine if he wants to use the function keys (F1-F10) or the Numpad (0-9)

If I use the function keys, underneath the button is a label showing which function key it is, in this case it's F1.

Now, if I change to the NumPad keys, the text of the label underneath changes to NumPad 0, but it ain't in the middle of the button, get me? Here's an image I quickly created;

So I need to change the location of the label, but I don't know how..