Accessing RectBorder Class Properties

I would like to turn off the border on build-in TextArea component.

Using the method found at http://livedocs.macromedia.com/flash/mx2004/main_7_2/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Flash_MX_2004&file=00002740.html

works for all the TextArea’s I am dealing with, however, it makes the window component created using PopUpManager.createPopUp transparent.

I guess what I really would LOVE to know is how to set the borderStyle to “solid” and then reset the borderColor.

Any clues?