I'm not aware of an easy way of doing that. What I sometimes do is go into Fireworks, draw a square, then draw the mask object on top of it and then combine the objects using a punch. This will result in a Path with the middle cut out that you can use for a normal mask, for example:
<s:Rect width="200" height="200" maskType="clip">
<s:Path data="M 75 77 L 125 77 L 125 127 L 75 127 L 75 77 Z M 0 0 L 0 203 L 200 203 L 200 0 L 0 0 Z ">
Thank you for answering! I think I need to keep looking for a solution to allow people to "see through" a certain part of the graphic element.
Thank you. I think this is as close as I'm going to get. I think for the number of "masks" I need to effect and my lack of expertise, I'm going to make a number of graphic plates in Photoshop and superimpose them on top of my "lower layer."
I really appreciate your code.
Is there any way to clip some part of image ?