> In that case you could subclass FXSlider and override the default 
> messages handlers for the SEL_MOTION, SEL_LEFTBUTTONPRESS and 
> SEL_LEFTBUTTONRELEASE messages.

using connect(), or is there another way?

> > And while I am at it: why doesn't connect() support
> > multiple message handlers?
> This may be changed in the near future; someone has recently posted some 
> code to the fxruby-users mailing list which address that very problem.

I have written a simple solution, which works quite well for me. It
took me exactly 10 minutes - yet another example how elegant Ruby is
:-)

class MultiConnectSlider < FXSlider
    def initialize(*params)
        super(*params)
        @sigHandler = Hash.new do |h, n|
            h[n] = Array.new
        end
    end

    def connect(signal)
        @sigHandler[signal].push Proc.new
        super(signal) do |sender, selector, data|
            @sigHandler[signal].each do |proc|
                proc.call(sender, selector, data)
            end
        end
    end
end