I'm using Qt 5.5.1 (64 bits) and I have a problem when I try add columns to one QML TableView.

I wrote a little example with my problem.

The program has a TableView and a button to add a new column, and fill the table with numbers.

Columns are added correctly, but when I fill the rows, I always have the same value in all the cells.

import QtQuick 2.3
import QtQuick.Controls 1.2
import QtQuick.Window 2.2

ApplicationWindow {
    title: qsTr("TableView example")
    id: root
    width: 640
    height: 480
    visible: true
    signal addColum();

    onAddColum: {
        var n = table.columnCount
        addColumnToTable("C"+n)
        fillRow()
    }

    function addColumnToTable(name) {
        var columnString = 'import QtQuick 2.3; import QtQuick.Controls 1.2; TableViewColumn {role: "' + name + '"; title: "' + name + '"; }';
        var column = Qt.createQmlObject(columnString, table)
        if (!table.addColumn(column))
            console.log("Error column",name)
    }

    function fillRow() {
        if (!tableModel.count) {
            tableModel.append({"C0":50})
        }
        else {
            tableModel.setProperty(0,"C"+(table.columnCount-1),50+table.columnCount-1)
        }
        var x = tableModel.get(0)
        console.log("Num. Columns",table.columnCount,"row object",JSON.stringify(x))
    }

    ListModel {
        id: tableModel
    }

    TableView  {
        id: table
        anchors.fill: parent
        anchors.margins: 20
        anchors.bottomMargin: 50
        model: tableModel
    }

    Button {
        anchors.top: table.bottom
        anchors.topMargin: 5
        anchors.horizontalCenter: parent.horizontalCenter
        text: "Add"
        onClicked: addColum()
    }
}

This is the console output, that seems OK
qml: Num. Columns 1 row object {"objectName":"","C0":50}
qml: Num. Columns 2 row object {"objectName":"","C0":50,"C1":51}
qml: Num. Columns 3 row object {"objectName":"","C0":50,"C1":51,"C2":52}
qml: Num. Columns 4 row object {"objectName":"","C0":50,"C1":51,"C2":52,"C3":53}

And The TableView is:
C0 C1 C2 C3
50 50 50 50

Somebody can found the mistake??

thanks