On ubuntu 12.04 I installed gWidgets and am intending to use RGtk2 binding. Now, invoking of single components like 

```
obj <- gbutton("hello man!", container = gwindow()) 

```

works, but whit other basic function

```
win <- gwindow("main app")
group <- ggroup(container = win)

```

I get the error I usually get when something`s not installed

```
Error in add(tag(obj, "contentPane"), value, expand = TRUE, fill = "both") : 
  error in evaluating the argument 'obj' in selecting a method for function 'add': Error     
  in function (classes, fdef, mtable)  : unable to find an inherited method for function   
 ".tag", for signature "<invalid>", "guiWidgetsToolkitRGtk2"

```

I tried reinstalling, both libgtk-dev, and R and gWidgets but nothing worked.

Any ideas?