# How to remove the chapter box for chapter*{} in fncychap?

I am using fncychap with the following configuration in a document:

\usepackage[Bjornstrup]{fncychap}
\ChTitleVar{\raggedleft\Large\rm\bfseries}


When I create a new chapter without a title, e.g. Dedication, a half-empty gray box is drawn on the page.

\newcommand{\dedication}{
\pagestyle{plain}
\chapter*{}
}

\dedication {
\begin{quote}
\raggedleft {\em to ...}
\end{quote}
}


I have looked at different parameters provided in the documentation but none of them seems to be related to removing this box on chapter*{}.

I was wondering if I can modify the definition of dedication or modify some configurations of fncychap to remove this box on certain chapters.

P.S. I prefer the text to be written where it is normally written and not moved up to where the gray box is.

Copy the following lines before the chapters where you want to header gone:

% Remove the gray box for chapter* with empty titles
\makeatletter
\renewcommand{\DOTIS}[1]{%
\vskip 40\p@%
}
\makeatother


And copy the following lines after the chapter is finished.

% Bring the gray box back for chapter* with titles
\makeatletter
\renewcommand{\DOTIS}[1]{%
\fboxsep=0pt
\colorbox[gray]{.85}{\rule{0pt}{40pt}\parbox[b]{\textwidth}{\hfill}}\\%
\nointerlineskip\raggedright%
\fboxsep=\myhi%
\colorbox[gray]{.85}{\parbox[t]{\mylen}{\CTV\FmTi{#1}}}\par\nobreak%
\vskip 40\p@%
}
\makeatother