i found a alternative.
It wokring but not like the mist and flood Buttons. (If estop is not hit i cant use the flood and the mist buttons until i hit the estop and i turn on the mschine. Well in my solutions i can turn on even the estop is not hit. But i can live with that)
I saw something interesstin according to mist or flood in the .UI file.
I didnt found anywhere "mist_action", only in .ui file. So i guess it is something implemented somewhere and thats why it was not wokring my setup with "air_action" because its anywhere implemented (in linuxcnc).
Maybe do you have any idea where could i find the "mist_action"