import { fromObject } from '@nativescript/core/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 ) ; }