import QtQuick
import QtQuick.Controls

Window {
    id: root
    width: 400
    height: 400
    color: "lightsteelblue"

    ComboBox {
        id: combo
        anchors.centerIn: parent
    }

    Loader {
        id: loader
        active: false
        sourceComponent: Component {
            Item {
                id: item
                property variant model: ListModel {
                    ListElement { text: "one" }
                    ListElement { text: "two" }
                }
                Component.onCompleted: combo.model = item.model
            }
        }
    }

    Timer {
        id: timer
        running: true
        repeat: true
        interval: 1000
        onTriggered: loader.active = !loader.active
    }
}