/// <returns>The new <see cref="ToolbarItem"/> which is inserted into the toolbar.</returns>
/// <seealso cref="InsertBefore(ToolbarItem, string, string)"/>
/// <since_tizen> preview </since_tizen>
/// <returns>The new <see cref="ToolbarItem"/> which is inserted into the toolbar.</returns>
/// <seealso cref="InsertBefore(ToolbarItem, string, string)"/>
/// <since_tizen> preview </since_tizen>