Unfortunately, "width" and "height" are properties, so they cannot be set using CSS.
Yeap, of course I know that. But isn't this a major flaw, when it comes to skinning properly an application without wanting to define the layout in the middle of the application "code"?
I normally post my ER's & bugs in Jira. I just wanted to make sure that there weren't other solutions before filling an ER.
For other people looking for this subject, my ER can be found here: https://bugs.adobe.com/jira/browse/SDK-21805