Tooltip. Relate two MC's

programming flash
1

Hello,

I have the following code:


  for(var r in map.Region){        
    
    var region : MovieClip = getChildByName ('R' + map.Region[r].Id) as MovieClip;   
    region.id = map.Region[r].Id; 

    var tooltip : Tooltip = new Tooltip();
    tooltip.x = region.x + (region.width + 120 - tooltip.width ) / 2;
    tooltip.y = region.y + (region.height - 80 - tooltip.height ) / 2; 
    tooltip.id = "T" + map.Region[r].Id;
    tooltip.mouseEnabled = false;
    addChild(tooltip);    

    region.addEventListener(MouseEvent.MOUSE_OUT, Region_Out);          
    region.addEventListener(MouseEvent.MOUSE_OVER, Region_Over);        

  }

And I have the event for each region:


function Region_Over(e : MouseEvent) : void {
  // Fade In Region
var tween:Tween = new Tween(e.currentTarget as MovieClip, "alpha", Strong.easeOut, 0.70, 1, 2, true);

// Show tooltip
  var tooltip : MovieClip = getChildByName ('T' + (e.currentTarget as MovieClip).Id) as MovieClip; 
  tooltip.alpha = 100;
} // Region_Over

function Region_Out(e : MouseEvent) : void {
  // Fade Out Region
  var tween:Tween = new Tween(e.currentTarget as MovieClip, "alpha", Strong.easeOut, 1, 0.70, 2, true);    
} // Region_Out

But now I would like the tooltip for each region to show when the mouse is over the correspondent region and to hide when the mouse is out of the correspondent region.

I added the Show Tooltip code inside the region mouse over even but I always get an error saying:
TypeError: Error #1009: Cannot access a property or method of a null object reference. at Map_fla::MainTimeline/Region_Over()

I am not sure what I am doing wrong … Any idea?

Thank You,
Miguel