I have encountered that situation several times when changing handlebars on my motorcycles.
Personally, I either bend, or remove the tab. The tab is there to prevent the control from rotating on the handlebars. If the fit is tight, the tab is not required. If the fit is loose, wrap some electrical tape around the handlebars before you install the controls.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894