To add a row to a ribbon panel
- Click Tools
tab
Customization
panel User
Interface. 
At the command prompt,
enter cui. - In the Customize User Interface Editor, Customize tab, in the Customizations In <file name> pane, click the plus sign (+) next to Ribbon Panels to expand it.
- Select the panel to which you want to add a row.
- Right-click
the selected panel. Click New Row.
- Click OK.