Gets the batch wide (observable) array of items.
import Batch = require("nativescript-batch");
var b = Batch.newBatch(function(ctx) {
console.log("Item #1 => " + ctx.items.getItem(0)); // 11
console.log("Item #2 => " + ctx.items.getItem(1)); // 22
});
b.batch.items.push(11);
b.batch.items.push(22);
b.start();