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Please feel free to change the title of this question since I'm not sure if it's fitting.

For example, I'd like to draw a rule with the same height as the thickness of a frame line of a standard tcolorbox.

I had a look at the tcolorbox package code, and I assume that the line leftrule/.store in=\kvtcb@left@rule is somehow essential for what I want. But if I try

\documentclass{article}

\usepackage{tcolorbox}

\begin{document}

\noindent\rule{\textwidth}{\kvtcb@left@rule}

\end{document}

it doesn't work and LaTeX returns the error ! Undefined control sequence..

So my more general question is: How can I access package internal values like this to use them in my document?

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1  
Please further specify what you mean by "it doesn't work". –  Jubobs Jun 29 '14 at 16:37
8  
You need \makeatletter before \rule and \makeatother after the closing brace. There is no general answer, I'm afraid: it much depends on what internal value you need access to. –  egreg Jun 29 '14 at 16:38
    
@Jubobs I edited my question. –  MaxD Jun 29 '14 at 16:42
    
Related: tex.stackexchange.com/q/8351/45734 –  MaxD Jun 29 '14 at 16:48

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