Rotate a sprite around any point.

See:

http://www.everydayflash.com/blog/index.php/2008/05/28/rotating-a-sprite-around-any-point/

Using the MX library in FlashDevelop

Can you not compile for and use the mx Libraries in FlashDevelop? Then do this:

Go to Project -> Properties
Select the 'Compiler Options' tab.
Open the 'Intrinsic Libraries' thing.
enter: Library\AS3\frameworks\Flex3