\n {(keytipAttributes: any): JSX.Element => (\n (this._splitButton = splitButton)}\n role={getMenuItemAriaRole(item)}\n aria-label={item.ariaLabel}\n className={classNames.splitContainer}\n aria-disabled={isItemDisabled(item)}\n aria-expanded={itemHasSubmenu ? item.key === expandedMenuItemKey : undefined}\n aria-haspopup={true}\n aria-describedby={mergeAriaAttributeValues(item.ariaDescription, keytipAttributes['aria-describedby'])}\n aria-checked={item.isChecked || item.checked}\n aria-posinset={focusableElementIndex + 1}\n aria-setsize={totalItemCount}\n onMouseEnter={this._onItemMouseEnterPrimary}\n onMouseLeave={\n onItemMouseLeave ? onItemMouseLeave.bind(this, { ...item, subMenuProps: null, items: null }) : undefined\n }\n onMouseMove={this._onItemMouseMovePrimary}\n onKeyDown={this._onItemKeyDown}\n onClick={this._executeItemClick}\n onTouchStart={this._onTouchStart}\n tabIndex={0}\n data-is-focusable={true}\n aria-roledescription={item['aria-roledescription']}\n >\n {this._renderSplitPrimaryButton(item, classNames, index, hasCheckmarks!, hasIcons!)}\n {this._renderSplitDivider(item)}\n {this._renderSplitIconButton(item, classNames, index, keytipAttributes)}\n
\n )}\n \n );\n }\n\n protected _onItemKeyDown = (ev: React.KeyboardEvent