I'm very confused on using scale 9 to position images in flex. I am using this link: http://www.adobe.com/devnet/flex/quickstart/embedding_assets/#EmbeddingImagesScale9
They have a width of 266 and height of 55...I get where the 266 and 55 come into play in the embed code: scaleGridTop="55", scaleGridBottom="137", scaleGridLeft="57", scaleGridRight="266" But where do the 57 and 137 come from?
