horizontal scrollbar for treeview

[binh_nx]

Hi Friends,
I have edited "treeview" project example.
I want to horizontal scrollbar is shown when width of Viewport < width of content.
Please help to solve this issue, thanks !.

This is my code:
ApplicationWindow {
visible: true
title: qsTr("Simple Tree View")

ItemSelectionModel {
    id: sel
    model: theModel
}

TreeView {
    id: idTest
    anchors.fill: parent
    model: theModel
    selection: sel
    itemDelegate: TreeDelegate {}

    TableViewColumn {
        id: columnTest
        role: "title"
        title: "Title"
        resizable: true
    }              
}

}