I've been getting into ltk, since I wanted to do some GUI programming again. I'm currently trying some things, one of them being changing the color of a button. This should be possible becaus of this bit of documentation. But it is not really specified how I could do it. I've tried with 'configure' and I tried in the initialization code and even in the 'pack' function, but it does not seem to work. It might be nice if the documentation told me how to do this.

The working code looks like this. How do I change the color of the button?

```

(with-ltk ()
  (let* ((frame (make-instance 'frame))
          (button (make-instance 'button
                                            :master frame
                                            :text "Hello, World"
                                            :command (lambda () (print "Hello, World")))))
    (pack frame)
    (pack button)))

```

Thanks in advance for any help.

Greetings,

Tom