Where is the setting for the tooltip background?

I set up a dark windows theme, and I’m kind of happy with the result, but the Tooltip background is still clear, which doesn’t work with the white text color.

Tooltip Background color

Any idea how (if ?) this background color can be changed ?
In Rhino ?
In Windows ?

Tool bar tool tips use system tooltip colors retrieved from Windows Forms.

Hi John,

is there a finite set of simple operations a moron like me can perform in order to change that color in “Windows Forms” ?

Never mind, I reverted back to a clear background interface.
Colors schemes are just too difficult to manage yet.