Hover / roll-over help in editor

Hopefully the answer to this question is a no-brainer for someone out there:

I have made the scheme for matlab/editor white text on black background and found it easy to change almost all of the highlighting (errors, suggestions, etc) so that the comments are easy to see.

However, in editor when matlab underlines something it wants corrected and I mouse over the text the highlight color and font color are both white. Does anyone know how to change this very specific highlight/font color without changing the font color for the whole environment?

Thanks in advance, Alex