VSTO Custom XML ribbon tab contains a group not specified in the XML - vsto

Question

I have a custom XML ribbon tab in a VSTO Excel Add-in. The XML for the custom ribbon tab is below.
<?xml version="1.0" encoding="UTF-8"?>
<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui" onLoad="Ribbon_Load">
<ribbon>
<tabs>
<tab idMso="TabAddIns" label="EMP">
<group id="EMPForms" label="Measurement Study">
<button id="EMPStudy"
label="EMP Study"
screentip="EMP Data"
supertip="Measurement Study Data"
onAction="OnEMPData"/>
<button id="StudySetup"
label="Study Setup"
screentip="Setup"
supertip="Measurement Study Setup"
onAction="OnStudySetup"/>
</group>
</tab>
</tabs>
</ribbon>
</customUI>
There is only one group specified in the XML.
When I run the Add-in, I get two groups. The first is "Custom Toolbars". The second is "Measurement Study". The "Custom Toolbars" is not specified in the XML below.
Is there a way to prevent groups or controls from other ribbon tabs from appearing on a custom ribbon tab?

Answer 1

Try to check out other add-ins and Excel documents (they may contain a custom ribbon UI).
There is no way to hide controls or groups on a custom ribbon tab if you don't know their IDs. The best what you can do is to use the startFromScratch attribute which allows hiding the built-in ribbon controls. Read more about the Fluent UI (aka Ribbon UI) in the following series of articles:
Customizing the 2007 Office Fluent Ribbon for Developers (Part 1 of 3)
Customizing the 2007 Office Fluent Ribbon for Developers (Part 2 of 3)
Customizing the 2007 Office Fluent Ribbon for Developers (Part 3 of 3)

Answer 2

The source of the "Custom Toolbar" group on my custom ribbon is the "Team Foundations Add-in".
Below are the steps that resolved this issue.
Start Excel.
Go to File | Options.
Click the "Add-ins" item in the list box on the left-hand side of the Excel Options dialog.
Select the "COM Add-ins" item of the Manage combo box.
Click the "Go..." button.
Clear the check box for the "Team Foundation Add-in" entry and click the "OK" button.
The "Custom Toolbars" group is no longer in the custom ribbon tab.