NativeScript/apps/app/ui-tests-app/list-view/item-re-layout.ts

import { fromObject } from "tns-core-modules/data/observable";

export function loaded(args) {
    var items = [];

    for (let i = 0; i < 100; i++) {
        items.push(fromObject({
            text:  "<" + i + ">",
            selected: !!!(i % 5)
        }));
    }
    args.object.bindingContext = { items: items };
}

export function toggle(args) {
    console.log("toggle : ")
    let context = args.object.bindingContext;
    console.dir(context);
    context.set("selected", !context.selected);
    // args.object.requestLayout();
}