Visibility

I cannot get the switch to hide. Why? Thanks

	<Component ID="FUEL_PEDESTAL">
		<Parameters Type="Override">
			<ENG_COUNT>2</ENG_COUNT>
			<TYPE>VALVE_SET</TYPE>
		</Parameters>
		<UseTemplate Name="ASOBO_FUEL_RunStop_Template">
			<ID>1</ID>
			<INTERACTION_TYPE>Push</INTERACTION_TYPE>
			<PART_ID>FUEL_Push_RunStop_1</PART_ID>  <!-- Must match Blender mesh -->
				<OVERRIDE_ANIM_CODE>
					(A:GENERAL ENG1 FUEL VALVE, Bool) 100 *
				</OVERRIDE_ANIM_CODE>
				<VISIBILITY_CODE>(A:GENERAL ENG1 FUEL VALVE, Bool) !</VISIBILITY_CODE>									
			<ANIM_NAME>Push_RunStop_1</ANIM_NAME>  <!-- Must match Blender animation -->
		</UseTemplate>					
	</Component>