R help - Jun 2008 - Cannot handle object of mode "list"

Hello..!!!
  I got a problem while built R program with tcltk. I try to list the name of
all data frame in my memory by "tklistbox". when we choose the name of
data frame, then i capture the name, and catch the data frame by
   
  tclObj(dat)<-as.data.frame(get(x,envir=.GlobalEnvir))
  tclvalue(dat)
   
  where x is the name of the data frame.The error is "Cannot handle object
of mode "list"". Note, that i have assign variable
"dat" by "dat<-tclVar()". so that it can be accesed by
another function in my program. I have tried things like this, and it can work
well. But why this time cannot work well?
   
  Please tell me what happen and how to fix it.
   
  Thank You

       
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