Citrix XenApp seamless published app of Excel not showing all workbook tabs on taskbar

Hello.  I have Excel published as a seamless application on a Windows 2008 XenApp 6 server.  Users would like to see each Excel workbook as a different tab on the local task bar but it only shows the active workbook as a single button.  It works fine in a published desktop and I did noticed this happening in another environment.  Word tabs work fine as a seamless app.
I found CTX101644 (see section below) and tried the reg change but no luck.

Any other suggestions?

MICROSOFT OFFICE APPLICATIONS SEAMLESS TASKBAR FUNCTIONALITY

Explanation: When using Microsoft Office Applications such as Excel, PowerPoint, Project and Access versions 2000-2003 on a MetaFrame XP or later server in a Seamless session, additional Taskbar Icons are not created on the local workstation Taskbar when creating new content in these applications – only a single Icon representing the application instance.

Each of these applications has an option that allows the display of additional Taskbar Icons named, “Windows in Taskbar”.

Support has been added in the updates listed below so that when running these Microsoft Office Applications in a Seamless session, and the option to add “Windows in Taskbar” is set, that additional Taskbar Icons are now created on the local workstation Taskbar when creating new content in these applications.

Create the following Registry key:

Path: HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\
Key Name: ExcelHook

Then add the following Value:

Path: HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\ExcelHook
Name: Enabled
Type: REG_DWORD
Data: 1

Thanks!