transparency

Due to lack of experience I am struggling with the following problem:
I use actionscript 3.0 in flash CS3.

I have made a movieclip from a blue rectangle. (by example)
Then I want to change the blue color into a red color.
The following cannot work. How can I do it correctly?

package{
import flash.display.MovieClip;
import fl.motion.Color;

import mcRectangle;

public class RectangleClass extends MovieClip{
var rectangle:mcRectangle;

public function RectangleClass(){
rectangle = new mcRactangle();
rectangle.x = 0; rectangle.y = 0;
rectangle.Color.setTint(0xFF0000,1); //hmmm
this.addChild(rectangle);
}
}
}

Code:

---

package {
        import flash.display.MovieClip;
        import fl.motion.Color;
        import flash.geom.ColorTransform;

        public class RectangleClass extends MovieClip {
                private var rectangle:mcRectangle;

                public function RectangleClass() {
                        rectangle = new mcRectangle();
                        rectangle.x = 0;
                        rectangle.y = 0;
                        var start_color:Color = new Color();
                        start_color.setTint(0xFF0000, 1);
                        var colorInfo:ColorTransform = rectangle.transform.colorTransform;
                        colorInfo.color = start_color.tintColor;
                        rectangle.transform.colorTransform = colorInfo;
                        addChild(rectangle);
                }
        }
}

---

Thanks a lot!