here is my complete 'TEST' UX button that I changed to give the buttons like you want .
Hope this helps 
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for adding your tmc on/off button I would do something like this
**ui**
add this
Code:
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and this
Code:
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then **lua**
add this
Code:
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* i have used - %lua.showtmc - for visibility
* i'm assuming you have these images in your UX - ico_TMCon.svg & ico_TMCoff.svg
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