modal styles

gistfile1.txt

var css:CSSStyleDeclaration = FlexGlobals.topLevelApplication.styleManager.getStyleDeclaration('global');

css.setStyle('modalTransparency', transparency);
css.setStyle('modalTransparencyColor', color);
css.setStyle('modalTransparencyBlur', blur);
css.setStyle('modalTransparencyDuration', duration);

You are the man! You can do this in a .css file too of course:

global
{
modalTransparency: .25;
modalTransparencyBlur: .25;
modalTransparencyColor: #000000;
}