Thanks for reporting the issue. I upgraded the Code Converter today to the latest version of NRefactory (the engine we use for our conversions). Can you retest your conversion and see what happens? If the results are still not what you expect, try posting a message in the SharpDevelop community forums since those are the guys actively developing the refactorign engine. If they improve their support for this scenario, we'll definitely upgrade our site, too.
Hope that helps.
P.S. The Converter is running very slow today due to some network backbone issues at the data center hosting the site. The problem is being actively addressed, so if things are too slow right now, check back in a few hours and they should have everything back to normal.