checkbox widget black and unreadable

[Lennart Borgman]

The checkbox type widget is on w32 black with a gray check mark. Nearly 
unreadable. Could this be changed?

To see this take the widget example from Info dir and change the 
beginning so that it looks like this:

(defun widget-example ()
 "Create the widgets from the Widget manual."
 (interactive)
 (switch-to-buffer "*Widget Example*")
 (kill-all-local-variables)
 (make-local-variable 'widget-example-repeat)
 (custom-mode) ;; <-- this line must be added!