In Flex 4 there is no longer such a thing as a 'background'. Instead, you define a rectangle in a skin with the fill properties that you need. This is great for many reasons, but it also causes some awkwardness with layouts. If your skin needs to define a background but also other elements like images, or vector graphics that need to be laid out horizontally, or vertically, or tiled (using the new layout mechanisms) - you can't - because since the background is just another first order element it will also adhere to the layout you specify and no longer encompass the entire component and act like a background.
Is there anyway to get around this? If not can I safely say that if you need a background in a skin then you have no choice but to use basiclayout? Thanks, Baz