Tk grid problem

Hi everybody,

I have a problem with the grid function in tk.
I juste try to put 4 buttons like this:

-------------------
|        |        |
|        |   C    |
|   A    |--------|
|        |        |
----------   D    |
|        |        |
|   B    |        |
-------------------

A is 2x2
C is 1x2
B is 1x2
D is 2x2

but the code bellow dont work :

require(tcltk)
tt <- tktoplevel(borderwidth=10)

A.but <- tkbutton(tt,text="A",command=function()ls())
B.but <- tkbutton(tt,text="B",command=function()ls())
C.but <- tkbutton(tt,text="C",command=function()ls())
D.but <- tkbutton(tt,text="D",command=function()ls())

tkgrid(A.but,row=1,column=1,columnspan=2,rowspan=2,sticky="nswe")
tkgrid(B.but,row=3,column=1,columnspan=2,rowspan=1,sticky="nswe")
tkgrid(C.but,row=1,column=3,columnspan=2,rowspan=1,sticky="wens")
tkgrid(D.but,row=3,column=3,columnspan=2,rowspan=2,sticky="wens")

any idea?

thx

Vincent

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