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3 Position L:Var Switch Needed for MSFS

Hello all,

I need a 3 position switch that would run a knob (or button for that matter) that would click through 3 positions and work L:Vars. I can see the shell of the 3 position switch in the Behaviors templates, but not the guts of how that would be written (the full version).

This is the Prepar3D version in ModelDef. This operates a selector that clicks through three codes which operate 'visibilities' of versions of wheel skirts. 1-old style, 2-new style, 3-nothing. Blank visibility. left Click or Mouse control.
I would be very grateful for any help. I havent been able to find a sample in MSFS that uses a stock Asobo GT code.


           (L:press skirt,bool) 100 *
 <TooltipText>Wheel Skirts Selector System; (%((L:SKIRTS SHOW,enum))%{case}%{:0}Old Skirts)%{:1}New Skirts)%{:2}No Skirts)%{End}</TooltipText>
<CallbackCode>(M:Event) 'LeftSingle' scmp 0 == if{ (L:SKIRTS SHOW,enum) 1 + 4 % (>L:SKIRTS SHOW,enum) 1 (>L:XMLSND1=7 ,enum) 1 (>L:press skirt,bool) } (M:Event) 'LeftRelease' scmp 0 == if{ (>L:press skirt,bool) }</CallbackCode>