How to rotate an Oval in OsiriX Lite?

[fil...@merantix.com]

How to rotate an ROI, e.g. an Oval, in OsiriX Lite? Is there any trick? Their FAQ lists the question ("How to rotate an ROI?", http://www.osirix-viewer.com/support/knowledge-base/) However, the answer is only accessible as premium user. Thank you very much for you answer!