async isOpen() {
        return (
            (await $(this.modalRootEl).isDisplayed()) &&
            (await $(this.modalRootEl)
                .$('h1')
                .isDisplayed()) &&
            (await $(this.modalRootEl)
                .$('select')
                .isDisplayed())
        );
    }
Returns true when the DatePicker modal is open, false otherwise.
@method
@returns {bool}