Steps to create Gradient Mask in Flash
1) Convert your image/graphic into a movieClip
2) Create your gradient mask area (transparent to black or black to transparent )
3) Convert the gradient mask area into a movieClip
4) Create three layers on stage "Action (to write actionSctipt), Mask, Image "
5) Place your image movieClip on Image layer, and name the movieClip instance as "myImage_mc"
6) Place the gradient mask movieClip on Mask layer, and name the movieClip instance as "mask_mc"
7) In Action layer write/copy the following code on the timeline
myImage_mc.cacheAsBitmap =true;
mask_mc.cacheAsBitmap = true;
myImage_mc.mask = mask_mc;
Here is the result.

1) Convert your image/graphic into a movieClip
2) Create your gradient mask area (transparent to black or black to transparent )
3) Convert the gradient mask area into a movieClip
4) Create three layers on stage "Action (to write actionSctipt), Mask, Image "
5) Place your image movieClip on Image layer, and name the movieClip instance as "myImage_mc"
6) Place the gradient mask movieClip on Mask layer, and name the movieClip instance as "mask_mc"
7) In Action layer write/copy the following code on the timeline
myImage_mc.cacheAsBitmap =true;
mask_mc.cacheAsBitmap = true;
myImage_mc.mask = mask_mc;
Here is the result.
