tcolorbox 中 tcbitemize 的 \newcommand

Question

如何修改tcolorbox中tcbitemize的行数和列数？

\newcommand{\boxdivide}[2][]
{\begin{tcbitemize}
[raster columns=#1,raster rows=#2,
    raster every    box/.style={colframe=white,colback=white},
    raster left skip=0pt,raster right skip=0pt,raster column 
    skip=0pt,raster before skip=0pt,raster after skip=0pt]} 
{\end{tcbitemize}}

给出错误。