mouse wheel input not registered [ScriptUI events]

Hello everybody,

I'm trying to make elements in a group move by using the mouse wheel / scroll wheel .

I can't find a way to make it do just that though. I have tried with various eventListeners for the mouse, but can't get any feedback.

It seems the only registered buttons are LMB, RMB and MMB-click.

Heres a small test-script for testing mouse input:

{
// AE mouse input


function ae_mouse_input_tester(thisObj){
  //== GUI ==//
  function GUI(thisObj){
  var builder = thisObj instanceof Panel ? thisObj : new Window("dialog", "Background Renderer", undefined,{borderless:false}, {resizable:true}) ;
  builder.onResizing = function(){
  builder.layout.layout(true)
  builder.layout.resize();
  }
  //-- USER INTERFACE --//
  var mWin = builder.add('group')
  mWin.orientation = 'column'
  mWin.size = [250,250]
  mWin.alignChildren = ['center','center']
  var btn1 = mWin.add('button',undefined,'button 1')
  var btn2 = mWin.add('button',undefined,'button 2')
  var scrl = mWin.add('scrollbar',undefined)
  scrl.alignment = ['fill','bottom']
  var log = mWin.add('StaticText',undefined,"console")
  log.alignment = ['fill','bottom']


  //-- EVENT HANDLERS --//
  //- Main Window
  // what's under the cursor
  mWin.addEventListener("mouseover",function(event){
  var target = event.target.toString()
  log.text = "target: "+target
  })
  // mouse button pressed
  mWin.addEventListener("mousedown",function(event){
  var mb = event.button
  switch (mb){
  case 0:
  log.text = "LMB v"
  break;
  case 1:
  log.text = "MMB v"
  break;
  case 2:
  log.text = "RMB v"
  break;
  default:
  log.text = mb
  }
  })
  // mouse button released
  mWin.addEventListener("mouseup",function(event){
  var mb = event.button
  switch (mb){
  case 0:
  log.text = "LMB ^"
  break;
  case 1:
  log.text = "MMB ^"
  break;
  case 2:
  log.text = "RMB ^"
  break;
  default:
  log.text = mb
  }
  })
  // mouse wheel NOT WORKING!!!!
  mWin.addEventListener("scrollwheel",function(event){
  log.text = event
  })
  //- Scrollbar
  scrl.onChange = function(){
  log.text = scrl.value
  }
  return builder;
  }


  var gui = GUI(thisObj)
  if (gui instanceof Window){
  gui.show()
  gui.center()
  }
}
ae_mouse_input_tester(this)
}

I'm using After Effects CC 2014 on a Windows 7 workstation.