OKay I think I have something.
Add a custom import event,
put inside it
import nme.geom.ColorTransform;
Then inside the normal code, but a block code
var ct_temp:ColorTransform;
ct_temp = new ColorTransform();
ct_temp.color = _Color; /// Color is the attribute of colour black for you, you have to create it
_image.colorTransform(_image.rect, ct_temp); // _image is the image of the Shadow ( not the image instance , the image)