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					Originally Posted by Guessed  Thanks for testing this guys. 
Italophile, I played with your template and didn't see the tab so I customized the code a little bit to get it showing but I still didn't see the behaviour that I was hoping for. At one stage the file opened with double-click working but then I couldn't reproduce that again. Does this version of the customui code work on your machine?
 
	Code: <customUI  
	xmlns="http://schemas.microsoft.com/office/2009/07/customui" 
    xmlns:mso="http://schemas.microsoft.com/office/2009/07/customui" >
	<ribbon>
		<tabs>
			<tab id="newTab" label="Hilite Test" keytip="H" insertBeforeMso="TabHome">
				<group id="newGroup" label="Test" >
				    <mso:gallery idQ="mso:TextHighlightColorPicker" showInRibbon="false" visible="true" size="large" />
				</group >
			</tab >
		</tabs>
	</ribbon>
</customUI> | 
	
 Yes that works as per your testing. As I previously noted "showInRibbon="false" " needs to be deleted to get rid of the on load error.
I think in my initial testing Word had got itself confused and resurrected the tab that I added via the GUI so that I could examine the RibbonX. Subsequent testing gives the same results as you get.
The standard ribbon uses several controls that cannot be implemented via RibbonX, and this is one of those.