Hi worach, and thanks, but I maybe didn't make the question clear enough. I was saying that you can push the button til it clicks and then continue pushing and there's another click. This led me to think that there were two different functions for that button.
Do you have the same model and is yours the same?
Anyway, I have a call into the company and I hope to hear from them when they return from holidays. Oh, and I do have that manuel so there's not all that much I haven't figured out since Xmas.
And happy new year!