Making controls less subtle

[David Epstein]

On my Mac, some LiveCode (10.0rc1) controls seem to me much too subtle, light gray where I would like there to be a distinct black line.  The  “slider” control looks to me as if it is disabled (although if I actually disable it, it gets even dimmer).  And the circle of the radio button, the rounded rectangle of a check box button, and the edges of an option button have this same light gray color.

Is there some way to change this?  

David Epstein