How to magnify a rounded rectangle

Question

Hello,
How to magnify a rounded rectangle if I would like the size
of it's rounded corners to stay fix? The script I draw the
rectangle with:
function DrawRoundedRectangle(X:Number, Y:Number, W:Number,
H:Number, Roundness:Number, Thickness:Number, Tint:Number,
Alpha:Number) {
_root.createEmptyMovieClip("Rect", 1);
_root.Rect.lineStyle(Thickness, Tint, Alpha, true, "none");
_root.Rect.moveTo(X, Y + Roundness);
_root.Rect.curveTo(X, Y, X + Roundness, Y);
_root.Rect.lineTo(X + (W - Roundness), Y);
_root.Rect.curveTo(X + W, Y, X + W, Y + Roundness);
_root.Rect.lineTo(X + W, Y + (H - Roundness));
_root.Rect.curveTo(X + W, Y + H, X + (W - Roundness), Y + H);
_root.Rect.lineTo(X + Roundness, Y + H);
_root.Rect.curveTo(X, Y + H, X, Y + (H - Roundness));
_root.Rect.lineTo(X, Y + Roundness);
DrawRoundedRectangle(10, 10, 120, 90, 10, 1, 0x000000, 100);
If I change it's _width or _height property unfortunately
it's rounded corners grows too. And the other problem I don't
understand: Why do the x and y coordinates of the rectangle change
when I magnify it?

Answer 1

I would use the 'scale9Grid' movieclip property, where as
when applied to a movieclip the rounded corners will not deform. An
easy way to use this property, if you can, would be to use it on a
movieclip symbol in the library where you can adjust the grids
during author-time. Here is a link from the livedocs;
http://livedocs.adobe.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveD ocs_Parts&file=00002512.html