R help - Jan 2012 - try() with silent=TRUE not preventing printing of error message

Hello,

We're curious to know why, on builds lacking Tcl/Tk,

    try(library(tcltk),silent=TRUE)

still allows the message to be printed:

    Error in firstlib(which.lib.loc, package) :
      Tcl/Tk support is not available on this system

though it does succeed in trapping the error condition?

Thanks,
Ben