treectrl scrollbar problem: "expected floiting point"

tktreectrl 2.3

I tried to make a scrollbars around a simple treectrl using an example in
"Understanding TkTreeCtrl.html". I got this error message:

expected floating-point number but got "0,616667"
while executing ".sv set 0 0,616667"

But tktreectrl 2.3 in itself runs without errors. - What is wrong with my
code?

My code is:

treectrl .t -showroot no -width 410 -height 300 \
-highlightthickness 0 -selectmode extended
..t configure -xscrollcommand ".sh set" -yscrollcommand ".sv set"

ttk::scrollbar .sh -orient horizontal -command ".t xview"
ttk::scrollbar .sv -orient vertical -command ".t yview"

pack .sv -side right -fill y
pack .sh -side bottom -fill x
pack .t -expand yes -fill both

set columnID [.t column create -itembackground linen]

..t element create elemBorder border \
-background #ece9d8 -filled yes -relief solid -thickness 1
..t element create elemText text

..t style create style1
..t style elements style1 {elemBorder elemText} .t style layout style1
elemBorder -union {elemText} -ipadx 4 -ipady 4 .t style layout style1
elemText

foreach n {5 15 20 10 10 5 15 10 20 15 15 25 10 5 15 5 10 20 15 25} {
set itemID [.t item create]
.t item style set $itemID $columnID style1 set text [string range
"abcdefghijklmnopqrstuvwxyz" 0 $n] .t item element configure $itemID
$columnID elemText -text $text .t item lastchild root $itemID
}

.

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