Pane and binding loop

[Tobias Fensch]

Hello,

why is this giving me a binding loop?
QML Pane: Binding loop detected for property "implicitWidth"

    Pane {
        id: root
        anchors.fill: parent

        GridLayout {
            id: rootLayout
            anchors.fill: parent
            columns: 2
            rows: 2
            columnSpacing: 10
            rowSpacing: 10

            GroupBox {
                id: grpCreateProject
                Layout.preferredWidth: parent.width * 1/3
                Layout.preferredHeight: 120
                Layout.column: 0
                Layout.row: 0
                title: qsTr("Neues Projekt anlegen")

            }

            GroupBox {
                id: grpAvailableProjects
                Layout.preferredWidth: parent.width * 1/3
                Layout.fillHeight: true
                Layout.column: 0
                Layout.row: 1
                title: qsTr("Projekt auswählen")

            }

            GroupBox {
                Layout.fillWidth: true
                Layout.fillHeight: true
                Layout.column: 1
                Layout.row: 0
                Layout.rowSpan: 2
                title: qsTr("Projektinformation")

            }
        }
    }

If I use an Item instead of the Pane, the binding loop is gone.

cheers,
Tobias