tablelist itemtodict

Hi
I have a small script.
##
set ::nix {{nix0 5 p-4 o0} {nix11 6 p-3 o2}}
::tablelist::tablelist .tbl -listvariable ::nix\
-columns "0 col1 left 0 col2 right 0 col3 center 0 col4 center"
.tbl columnconfigure 0 -name col0
.tbl columnconfigure 1 -name col1
.tbl columnconfigure 2 -name col2
.tbl columnconfigure 3 -name col3
pack .tbl
puts "itemtodict : [.tbl itemtodict 0]"
##
the puts command show me: % itemtodict : col0 0 col1 {} col2 {} col3 {}
I expected that I get "col0 nix0 col1 5 col2 p-4 col3 o0".
I'll get all values from a row with columnname like a dict.
What do I wrong or I don't understand?
regards
Manfred