[R-gui] tcltk problem using "in"

Replying to myself, though not sure that the threading will be  
preserved (long story short: I use gmail+pop, and as a consequence  
don't see my posts to the list, so I am responding to my sent message).

The problem is "explained" by the following code:

tktest <- function(parent) {
   fr <- tkframe(parent, borderwidth=2, relief="raised")      # Line 1
   l1 <- tklabel(parent, text="b")                           # Line 2
   l2 <- tklabel(fr,text="a")
   tkgrid(l1,l2, `in`=fr)
   fr
}

tt <- tktoplevel()
tf1 <- tktest(tt)
tkgrid(tf1)

The above code, as it stands, produces a nice frame with two letters,  
a and b, in it.
Now, if we interchange the lines I called Line 1 and Line 2 above,  
then in the resulting frame b doesn't show up any more, though there  
is space reserved for it.

In other words,  a widget cannot be inserted into a frame that was  
created after the widget came to existence (in which case we have to  
use the "in" argument). A quick check with code directly in Tcl/Tk  
seems to indicate that this is actually a limitation of Tcl/Tk  
(sounds to me a bit silly to have such limitation though).

Unfortunately, this makes what I was intending to do a lot more  
difficult. I was hoping to create "tkcbind" and "tkrbind" commands to  
allow one to build the GUI from the ground up. It sounds like I would  
need, at the very least, to specify beforehand the overall frame  
structure, and thus move top-to-bottom instead.

Is this problem documented anywhere?

Haris Skiadas
Department of Mathematics and Computer Science
Hanover College

Hello all,

	I've been struggling for the best part of the last couple of hours  
with the following simple problem. Consider the following code:

library(tcltk)
tktest <- function(parent, wdgt) {
  fr <- tkframe(parent, borderwidth=2, relief="raised")
  tkgrid(wdgt, `in`=fr)
  tmp <- tklabel(fr, text="hi")
  tmp2 <- tklabel(parent, text="there")
  tkgrid(tmp)
  tkgrid(tmp2, `in`=fr)
  fr
}
tt <- tktoplevel()
t2 <- tklabel(tt,text="a")
t3 <- tklabel(tt,text="b")
sg <- tktest(tt,t2)
t4 <- tklabel(sg,text="c")
tkgrid(t3,`in`=sg)
tkgrid(t4)
tkgrid(sg)



Now, the resulting window contains the frame sg, with room in it  
for all 5 strings a, hi, there, b, c,    BUT a and b are not showing!
So, I am wondering what I am doing wrong. The `in` call seem to  
work in one case, and fail in the other two cases, and I can't tell  
what the difference is, especially between the "there" and "b"  
cases. What I find more weird is that the space is allotted, but  
not used.

Any help appreciated, I am starting to lose my mind over here.

Haris Skiadas
Department of Mathematics and Computer Science
Hanover College