[TIMOB-504] auto focus textarea on window open has slight up/down motion after focus

here's the code (put into an app.js)

var win = Titanium.UI.createWindow({
backgroundColor:'#ccc' });

var textarea = Titanium.UI.createTextArea({
left: 10, top: 40, width: 100, height: 100, });

win.add(textarea);

win.addEventListener('open', function()
{

    textarea.focus();

}) win.open();