Use \subfloat in custom float/caption [closed]

I am trying to use subfloats in a custom caption/float environment. But I get compilation errors.

MWE:

\documentclass[a4paper]{report}

\usepackage[margin=10pt,font=small,labelfont=bf,justification=centering,belowskip=0pt]{caption}

%%Charts
\DeclareCaptionType[fileext=loc,placement=b,within=chapter]{chart}[Chart][List of Charts] %list of charts is generated by \listofcharts
\crefname{chart}{chart}{charts}

\begin{document}

\begin{chart}[!h]
\centering%
\subfloat[Test 1]{\includegraphics[width=0.4\textwidth]{Test1.pdf}\label{chrt:Tests:1}}%
\subfloat[Test2]{\includegraphics[width=0.4\textwidth]{Test2.pdf}\label{chrt:Tests:2}}%
\caption{Tests}%
\label{chrt:Tests}%
\end{chart}

\end{document}

If I change \begin{chart} to \begin{table} and \end{chart} to \end{table} this suddenly works...

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closed as too localized by Paulo Cereda, lockstep, egreg, Thorsten, Marco DanielMar 4 '12 at 15:36

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RTFM, Section "2.1.2 The \newsubfloat Command" –  Axel Sommerfeldt Feb 21 '12 at 20:29
Ok, I added \newsubfloat{chart} and now it sortof works. However cleveref doesn't seem to inherit the "chart" label from chart. Any idea how I can fix that? –  Matthias Feb 22 '12 at 13:16
RTFM (cleveref), Section 7.1.2 "Customising Individual Cross-Reference Types" ;-) –  Axel Sommerfeldt Feb 24 '12 at 17:34