Sue,
No our fixtures are not the multi-toggle. Just two 12" tubes in a fixture with a clear plastic cover. ON-OFF Switch is on the end (not facing down as someone described). Cover wraps completely around from side to side. We've pinched, squeezed, coaxed, and even urged with a table knife blade. Nada. Won't budge. I can see where little tabs on the cover snap into the assembly (3 to a side). There must be a chinese puzzle gentle movement secret. It evades me.