CXTPWinThemeWrapper problem

I'm little bit confused.
When I've tried to use theme wrapper in dll I've got link error on OpenThemeData(). Looks like no export declaration only for that function.

Used code:
CXTPWinThemeWrapper themeScroll;
themeScroll.OpenThemeData(0, L"SCROLLBAR");
themeScroll.DrawThemeBackground(dc.GetSafeHdc(), SBP_SIZEBOX, SZB_RIGHTALIGN, &rect, 0);

Output:
error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall CXTPWinThemeWrapper::OpenThemeData(struct HWND__ *,unsigned short const *)" (__imp_?OpenThemeData@CXTPWinThemeWrapper@@QAEXPAUHWND__@@PBG@Z) referenced in function "public: void __thiscall CPlugInsRibbonHelper::SetUsed(class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > > const &,int)" (?SetUsed@CPlugInsRibbonHelper@@QAEXABV?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@H@Z)
.\..\Debug/***.dll : fatal error LNK1120: 1 unresolved externals

In code below no errors found but sure not works. Other methods of CXTPWinThemeWrapper imported ok.

CXTPWinThemeWrapper themeScroll;
//themeScroll.OpenThemeData(0, L"SCROLLBAR");
themeScroll.DrawThemeBackground(dc.GetSafeHdc(), SBP_SIZEBOX, SZB_RIGHTALIGN, &rect, 0);

When I use that code in main exe all ok, no errors. Problem only in all my dlls.

Any help would be appreciated :)

Oleg, thanx a lot!
I've just found your answer in tread http://forum.codejock.com/forum_posts.asp?TID=6299 and intended to try :)
Anyway, you a great.

PS. It should be boring to answer the same dumb questions all the time, isn't it? :)))

PPS. Why I'm asking, I'm working on Sunday too :)