Dear all, 

I have a graph which i need to explain in the caption. Unfortunately I need 
numbers and letters with a circle around in order to explain it (which is a 
scanned image). Therefore, I defined a new command in the preamble of the main 
document  

\usepackage{tikz}
\newcommand*\mycirc[1]{%
\begin{tikzpicture}[baseline=(C.base)]
\node[draw,circle,inner sep=1pt](C) {#1};
\end{tikzpicture}}

and here the preview of the latex-code, I inserted the command via ERT:

\begin{figure}
\noindent \begin{centering}
\includegraphics[scale=0.5]{\string"../Pics/Chapter/1_\string".png}
\par\end{centering}
\caption{ diagram displaying the corrosion
\mycirc{1}\label{fig:1} }
\end{figure}


I cannot compile it, even when I insert the command directly into the caption, 
like

\begin{tikzpicture}[baseline=(C.base)] \node[draw,circle,inner sep=1pt](C) {1}; 
\end{tikzpicture}

it only produces errors, while both possible ways work outside the caption in 
standard environment. 

Could anybody help me to get around that problem inside the caption 
environment? 
thanks a lot and all the best! 

Christoph 

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