[TIMOB-19958] Windows: Missing events in ScrollableView

   var win = Ti.UI.createWindow();
   
   var img1 = Ti.UI.createImageView({
       image: 'http://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/' +
           'Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg/' +
           '402px-Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg'
   });
   var img1Wrapper = Ti.UI.createScrollView({
       maxZoomScale: 4.0,
   });
   img1Wrapper.add(img1);
   
   var img2 = Ti.UI.createImageView({
       image: 'http://www.nasa.gov/images/content/' +
           '616903main_rover_comparison1600_1600-1200.jpg'
   });
   var img2Wrapper = Ti.UI.createScrollView({
       maxZoomScale: 4.0,
   });
   img2Wrapper.add(img2);
   var photosView = Ti.UI.createScrollableView({
       showPagingControl: true,
       views: [img1Wrapper, img2Wrapper]
   });
   win.add(photosView);
   photosView.addEventListener('dragend', function(e) {
       Titanium.API.info("dragend");
   });
   
   photosView.addEventListener('dragstart', function(e) {
       Titanium.API.info("dragstart");
   });
   
   photosView.addEventListener('scroll', function(e) {
       Titanium.API.info("scroll");
   });
   
   photosView.addEventListener('scrollend', function(e) {
       Titanium.API.info("scrollend");
   });
   
   
   win.open();