Colors of tooltips in themes

[Bertrand Dekoninck]

Hi, everyone on the list. Tooltips in GNUstep are displayed with a 
light yellow background and TextControlColor in all the themes I've 
reviewed.
This doesn't work for dark themes like ThinkDark and Sombre, because 
TextControlColor is white and not black so the text of the tooltip 
can't be read.
I did not find in thematic a way to change this. Has anyone a clue on 
this, or should I begin to add some code in Sombre.theme to handle 
this ?

Bertrand.

PS : there are some "code snippets"  available in Thematic, but I 
can't figure how to use this feature, and it seems to be broken  as 
Thematic complains not being able to find the "make" program. Is it 
really implemented ?