Syntax highlighting for \parbox

It seems that the current syntax highlighting does not support \parbox command (which is very similar to \text). In the tex code below, "footext" is highlighted as a normal text but "fooparbox" as a formula.    

```tex
\documentclass{minimal}
\begin{document}
Hello world!
\begin{equation}
  \parbox{10cm}{fooparbox $bar$}
  \text{footext $bar$}
\end{equation}
\end{document}
```




