<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">
	<ribbon startFromScratch="false">
		<tabs>
			<tab id="customTab" 
			     label="POWEREXCEL" 
			     insertBeforeMso="TabHome">
				
				<group id="customGroup1" label="1st Group">
					<button id="customButton1" label=" " />
				</group>

				<group id="customGroup2" label="2nd Group">
					<button id="customButton2" label=" " />
				</group>

				<group id="customGroup3" label="3rd Group">
					<button id="customButton3" label=" " />
				</group>
                               
			</tab>
		</tabs>
	</ribbon>
</customUI>