Radio Buttons or similars

Hello companions!!!

I have a function that creates a Radio Buttons, and I need that this
function return the selected value in the Radio Buttons. I would like that,
if somebody know as I could return the value, you say me as do it.

Next, I show the function


function1<-function(){
       require(tcltk)
       tt <- tktoplevel()
       rb1 <- tkradiobutton(tt)
       rb2 <- tkradiobutton(tt)
       rbValue <- tclVar("oranges")
       tkconfigure(rb1,variable=rbValue,value="apples")
       tkconfigure(rb2,variable=rbValue,value="oranges")
       tkgrid(tklabel(tt,text="Which do you prefer?"))
       tkgrid(tklabel(tt,text="Apples "),rb1)
       tkgrid(tklabel(tt,text="Oranges "),rb2)
       value<-0;
       aux_function<- function()
       {
           rbVal <- as.character(tclvalue(rbValue))
           tkdestroy(tt)
           if (rbVal=="apples")
               tkmessageBox(message="Good choice!  An apple a day keeps the doctor
away!")
           if (rbVal=="oranges")
               tkmessageBox(message="Good choice!  Oranges are full of Vitamin C!")
           print(rbVal);
           return(rbVal);
       }
       OK.but <- tkbutton(tt,text="OK",command=function() aux_function())
       #OK.but <- tkbutton(tt,text="OK",command=function() value<<-aux_function())

       tkgrid(OK.but)
       tkfocus(tt)
       #return(value)
       }




Thanks in advance!
A greetings Luismi
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