Hook the mouse over event and stop it propagating further down the scenegraph

entity.mouseOver(function (event, control) {
    // Mouse over with button
    console.log('Mouse over button: ' + event.button);

    // Stop the event propagating further down the scenegraph
    control.stopPropagation();

    // You can ALSO stop propagation without the control object
    // reference via the global reference:
    ige.input.stopPropagation();
});