Light groups not working (using philips hue and openHAB 2.0b4)

I am working on a basic setup but very early in the proces I am stranded due to groups not working as I would expect them. I looked at some examples and I don’t see what I am doing wrong, any help would be greatly appreciated.

I have the current .items setup

Group all "All"
Group:Switch:OR(ON, OFF) g_licht_woonkamer "Licht Woonkamer" (all)

Color Light_1 "Lamp woonkamer bank" <light> (g_licht_woonkamer)  {channel="hue:0210:0017880aeed4:4:color"}

And this in my sitemap

sitemap demo label="My home automation" {
    Frame label="Licht" {
        Switch item=g_licht_woonkamer icon="switch" mappings=[ON="ON",OFF="OFF"]
        Switch item=Light_1

The single item switch works fine but the group item switch does noting. Thanks for the help