Not possible to use ContextMenu on event-consuming types like Pane

import QtQuick
import QtQuick.Controls.Basic

ApplicationWindow {
    id: window
    width: 600
    height: 400
    visible: true

    Pane {
        anchors.fill: parent
        anchors.margins: 20

        ContextMenu.menu: Menu {
            MenuItem {
                text: qsTr("Eat tomato")
            }
            MenuItem {
                text: qsTr("Throw tomato")
            }
            MenuItem {
                text: qsTr("Squash tomato")
            }
        }
    }
}