# Knitr Plot Tooltips for ADA Compliance

I would like to use Knitr to generate plots in R that have hover-over tooltips. Here is a working example without an R tooltip:

    \documentclass{article}
\usepackage{pdfcomment}
\begin{document}
No tooltip here. {\pdftooltip{Hover here for a tooltip!}{I am a tooltip.}}
<<>>=
library(knitr)
plot(c(runif(10),runif(10)))
@
\end{document}


Here is an example that does not work but that demonstrates what I have in mind:

    \documentclass{article}
\usepackage{pdfcomment}
\begin{document}
No tooltip here. {\pdftooltip{Hover here for a tooltip!}{I am a tooltip.}}
{\pdftooltip{
<<>>=
library(knitr)
plot(c(runif(10),runif(10)))
@
}{Tooltip for graphic.}}
\end{document}


The issue seems to be the \begin{knitrout} and \end{knitrout} environment tags. Is anyone aware of a work around?