How to customize ComBox Popup items

I am trying to customize the QML 2.14 ComboBox, and I did follow Customizing ComboBox documentation, but I am not able to customize the ComboBox -> Popup -> ListView -> "delegate".

I want to have a different text color for the list item displayed inside the ComboBox Popup.

ComboBox {   id: myComboBox   model: ["First", "Second", "Third"]   popup: Popup {      y: myComboBox.height - 1      width: parent.width      implicitHeight: contentItem.implicitHeight      contentItem: ListView {          clip: true          anchors.fill: parent          model: myComboBox.popup.visible ? myComboBox.delegateModel : null          ScrollIndicator.vertical: ScrollIndicator {}          delegate: Text {              width: parent.width              height: 30              text: "Test" // How to access flat model, modelData is null and model.get(index) is not allowed in .ui.qml                color: "#ffffff"              anchors.horizontalCenter: parent.horizontalCenter              anchors.left: parent.left          }          highlight: Rectangle { color: "yellow" }       }   }}

But I always see some default list with black text, in the combobox popup.

I'm also not able to apply the highlight to the selected line in the popup.