customer scrollbar does not show up in TableView

[JoeCFD]

customerized scrollbar shows up if HorizontalHeaderView is removed.
If HorizontalHeaderView is added, TableView is not displayed and an error follows:
QML TableView: Cannot anchor to an item that isn't a parent or sibling

Both HorizontalHeaderView and TableView are inside ScrollView. What is wrong? They are not siblings anymore inside ScrollView? If ScrollView part is removed, scrolling still works, but no scrollbar is displayed.

GroupBox {
    id: root

    label: Label {
        id: titleLabel
        text: qsTr( "TestTable" )
    }

    ScrollView {
        id: packageListScrollView
        anchors.fill: parent
        ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
        clip: true

        HorizontalHeaderView {
             id: packageListTableHeader
             syncView: packageListTable 
            anchors.top: parent.top

             delegate: Rectangle {}
       }

      TableView {
          id: packageListTable        
         anchors.top: packageListTableHeader.bottom
          clip: true

          model: tableViewModel;

          delegate: Rectangle {}
         }

        ScrollBar.vertical: ScrollBar {
            anchors.right: parent.right
            policy: ScrollBar.AsNeeded

            // Gutter/Trough
        }
    }
}

[JoeCFD]

@JoeCFD said in customer scrollbar does not show up in TableView:

TableView

TableView does not need ScrollView and its ScrollBar.vertical is ok.