[R] tcltk problem

[Erich Neuwirth]

OSX 10.10.2
R 3.1.3
XQuartz installed.

I am trying to run one of the tcltk demos
This one works:

tt <- tktoplevel()
label.widget <- tklabel(tt, text = "Hello, World!")
button.widget <- tkbutton(tt, text = "Push",
                          command = function()cat("OW!\n"))
tkpack(label.widget, button.widget) # geometry manager
                                    # see Tk-commands


But the next one breaks:
> if(as.character(tcl("info", "tclversion")) >= "8.5") {
+   # make use of themed widgets
+   # list themes
+   as.character(tcl("ttk::style", "theme", "names"))
+   # select a theme -- here pre-XP windows
+   tcl("ttk::style", "theme use", "winnative")
+ } else {
+   # use Tk 8.0 widgets
+ }
Error in structure(.External(.C_dotTclObjv, objv), class = "tclObj") :
  [tcl] bad command "theme use": must be configure, map, lookup, layout, theme, or element.

What is going wrong here?

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