Changing Bitmap Color using colorTransform

Question

I am having a bit of a problem where I have a function that takes a ColorPickerEvent. I am trying to colorTransform a "loaded bitmap" of a movieclip to the selected color but For some reason it is not setting
// colour
function setColourFor(e:ColorPickerEvent){
          var image:InteractivePNG = getChildByName(type) as InteractivePNG; // movieClip
          var bitmap:Bitmap = image.getChildAt(0) as Bitmap; // loaded PNG
               var c:ColorTransform = bitmap.transform.colorTransform;
          bitmap.transform.colorTransform = new ColorTransform();
          c.color = e.color; // colorpickerevent
          bitmap.transform.colorTransform = c;
the bitmap color doesn't seem to change.
It works however if I were to set the movieclip's colorTransform (var image)
I'd note that the Bitmap contains PNG' with some transparency

Answer 1

hi
change the last line of your function to:
bitmap.transform.colourTransform(bitmap.bitmapData.rect, c);
the first parameter is a Rectangle object defining the area of the bitmap that the transform affects