How to use the alloyeditor.EzBtnImageVariation function in alloyeditor

/**
     * Lifecycle. Renders the UI of the button.
     *
     * @method render
     * @return {Object} The content which should be rendered.
     */
    render() {
        return (
            <select tabindex="{this.props.tabIndex}">
                {this.getImageVariationOptions()}
            </select>
        );
    }
}

AlloyEditor.Buttons[EzBtnImageVariation.key] = AlloyEditor.EzBtnImageVariation = EzBtnImageVariation;
eZ.addConfig('ezAlloyEditor.ezBtnImageVariation', EzBtnImageVariation);

* @return {Object} The content which should be rendered.
     */
    render() {
        return (
            <select tabindex="{this.props.tabIndex}">
                {this.getImageVariationOptions()}
            </select>
        );
    }
}

AlloyEditor.Buttons[EzBtnImageVariation.key] = AlloyEditor.EzBtnImageVariation = EzBtnImageVariation;

const eZ = (window.eZ = window.eZ || {});

eZ.ezAlloyEditor = eZ.ezAlloyEditor || {};
eZ.ezAlloyEditor.ezBtnImageVariation = EzBtnImageVariation;