Icons in XY graph scale legend

[Arrowin]

Unfortunately, you are changing the Lock button which is easy since the lock icon is part of the button.
The other two buttons X and Y are not easy to change, try it for yourself and you will see that the top X/Y icon is always there unless you make the buttons really small.

[drjdpowell]

Finally got around to taking advantage of this conversation with my "Flatline" set of controls.  Scale legend looks like: