Resize the object from left to right. Notice how only the middle part resizes and the end parts remain the same? Splitting it into its components as a RectangleStyle is what allows that. If it were called as just a straight image, then you'd have to stretch the end caps to get a larger middle section.
The EastShrink stuff there controls how it handles the resize. (Too tired to go through it piece by piece at the moment.)
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If it ain't broke, it needs more features!
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