title: Adding background image to mx component while using flex 4
body: <p>Again, a theming question. Because the project I'm working on requires <a href="http://code.google.com/p/dockableflex/" rel="nofollow">older libraries</a> that extend mx components (such as TitleWindow and TabNavigator), I can't use what I know about Spark skinning directly. However, since the project is being programmed using the default Spark theme (with my modifications on top) rather than the Halo theme, I apparently don't have access to the styles I need (namely backgroundImage and contentBackgroundImage which apparently require Halo to be active). Simply setting Halo to be the theme will break other things, not the least of which my own theme. Plans are in the works to replace the older libraries or at least patch them better to Flex 4, but as of right now, I need a way to style/skin these components without modifying them directly.</p>
  
  <p><strong>It would be ridiculous to be unable to add a background image to a TitleWindow's content area!</strong> I've searched the internet high and low all day and tried countless variations of styles, skins, selectors, and combinations thereof with no luck. <em>Doesn't anyone know how to add a background image to the content of a mx TitleWindow while using the Flex 4.1 sdk?!</em></p>