Build [C++ Error] CCALENDR.h(47): E2015 Ambiguity between 'TGridDrawState' and

C++builder编译时出现如下问题：
Build
  [C++ Error] CCALENDR.h(47): E2015 Ambiguity between 'TGridDrawState' and 'Grids::TGridDrawState'   [C++ Error]