correct comctl32 implementation

[Andrew Green]

I have been researching how i could implement the gsoc Theming -
Implement Wine theming support.
Though I'm a bit confused what is wanted.
So is the case that completely separate dll's should be written for
different versions and be loaded by side-by-side assembly.
So you would end up with "comctl32v5.dll","comctl32v6.dll","comctl32v7.dll"?
Would these be 3 different code basses or should they be made to share
most of there code?