Fade movie clip with script

I’ve searched and found similar posts, but having not used flash for years, I am back to learning from ground up.

I found this script and works well

import fl.transitions.Tween;
import fl.transitions.easing.*;

var myTween:Tween = new Tween(banana_mc, "x", Elastic.easeOut, 50, 450, 3, true);

and does exactly what the example shows… now I want to fade it in… but this code below, that I’ve found on flash help, won’t work, just want to know what I’m missing

import mx.transitions.Tween;
import mx.transitions.easing.*;

new Tween(banana_mc, "_alpha", Strong.easeIn., 100, 0, 3, true);

using flash 8 and I don’t use both codes at the same time, basically I just use it for trial and error testing.

thanks for any clarification on what is wrong/missing in the code