How to setup Elro AB600ID

[Bluffpearce]

I have a Elro AB600ID dimmer and a AB600M switch
The switch has 2 buttons. One for on\off and one for the dimmer function

In domoticz, i have made a ARC on\off switch.
The dimmer reacts to the commands
How ever the behaviour is not wright
When i turn the switch on, nothing happens
When i turn the switch of, light goes on
When i turn the switch on again, the dimmer cycles it's level
When i turn the switch of, light goes off

I have changed the switch to ARC push off.
Now i can turn the light on and off, but no dimmer function

Does anybody know how to configure this correctly?