[R] sourcecode for the balloonplot function from the gplots package

[ravi]

Hi,
I want to take a look at the sourcecode for balloonplot. I would appreciate it if I could get help on overcoming the following problem :

> methods(balloonplot)
[1] balloonplot.default* balloonplot.table*  

   Non-visible functions are asterisked
> balloonplot.default
Error: object 'balloonplot.default' not found
>
How do I access the non-visible functions?
Thanks,
Ravi