Split Upgraded Form and UserControl Classes?

Hello all,

I've got a number of projects which were upgraded from VS.NET 2003 to VS 2005. All the forms and user controls which were created in the previous project are still in the single-file form. I would really like it if they could be split into partial classes, with the 'Xxxx.Designer' file, the same as those which were newly created in 2005. I can work out how to do it manually but cutting and pasting and editing the vbproj file, but that's a long-winded process and there are quite a lot of these classes / projects. Does anybody know of a tool or plug-in which can do this in an automated fashion?

Thanks,
I