[TIMOB-13136] BlackBerry : In a complex layout the parent view starts rendering the controls before they are placed in their positions

Descriptions: 1.Run the code snippet below on BB simulator/device

var win = Titanium.UI.createWindow();
 
var scroll = Ti.UI.createScrollView({
    backgroundColor: '#ccc',
    width: 200,
    height: 300,
    layout: 'vertical',
    contentHeight: Ti.UI.SIZE,
    contentWidth: Ti.UI.FILL
});
 
function MyButton(title) {
    return Ti.UI.createButton({
        title: title,
        top: 10
    });
}
 
for(var i = 0; i < 100; i++) {
    scroll.add(MyButton('Button #' + (i + 1))); 
}
 
win.add(scroll);
win.open();

Actual Result: 1.Notice when the app starts you can see that the parent view starts rendering the buttons even before the buttons are where they should be actually. 2.You will the buttons start getting rendered from the left of the screen when you run the app. 3.In more complex apps with many controls & window it will not be pleasing so see this after we start the app Expected Result: 1.The parent should wait for the controls to be in their positions before it starts rendering them