I love the new AdvancedDataGrid for Flex 3.0, it can do multiple column sorts, group my data and provide a tree view, among other amazing things. My problems began when I wanted to handle sorting of multiple properties in my own in code. The short version is that you need to apply the sort to the dataProvider property of the grid, not to your GroupingCollection. That does work, but I dug into it a bit more to find out, at least partly, why it worked.
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If the shortest distance between two points is a straight line, then the shortest distance between start and finish of a quick hack is “every relevant programming language.” Thus, not too long after hacking out some PHP, Python, XSLT, Bourne Shell script, Regular Expressions and Actionscript I completed a small Flex application that, given a swc, determines and visually represents the size of its library dependencies.
You can try it out here:
http://blogs.soph-ware.com/posted-content/files/SwfSizeDisplay/