app.js

var w = Ti.UI.createWindow({ backgroundColor: 'red' });

var sv = Ti.UI.createScrollView({
  width: '100%',
  height: '100%' });
w.add(sv);

var wr = Ti.UI.createView({
  top: 10,
  left: 10,
  right: 10,
  bottom: 10,
  layout: 'vertical',
  backgroundColor: '#ccc' });

wr.add(Ti.UI.createView({
  backgroundColor: 'yellow',
  height: 400
}));

var inv = Ti.UI.createView({
  backgroundColor: 'green',
  top: 10,
  height: 300,
  visible: false
});
wr.add(inv);

sv.add(wr);


w.open();

setTimeout(function() {
  inv.visible = true;
  wr.height = Ti.UI.SIZE;
}, 2000);