title: "Freeze" the slider
body: <p>Is it possible to "freeze" the slider (NSSlider)? I'd like to make my slider unmovable (with a fixed value) when I press the button "Start", which starts my application... And when I press the button "Stop", which terminates my apllication, I'd like the slider to become movable again.</p>
  
  <p>Thanks for the answer!</p>