Perspective: How to use Horizontal Menu without page links

v8.0.15

I want to use the horizontal menu to change a session custom property and display as selected when clicked. I can bind to each of the items’ styles for the display (little bit inconvenient but it will work), however I’m not sure how to do the writing to the session property?

Also, when I tap on the buttons on mobile, it keeps selecting the button text and then chrome brings up the “search the internet for the selected text” prompt at the bottom… can I disable selecting text?