[TIMOB-16208] iOS: Window focus and blur events no longer fire after hiding a window

var baseWindow = Ti.UI.createWindow({ backgroundColor: 'blue', title: 'Base Window' });
baseWindow.addEventListener('focus', function() {
    alert('baseWindow was focused');
});
baseWindow.addEventListener('blur', function() {
    alert('baseWindow was blurred');
});

var openWin1Button = Ti.UI.createButton({
    top: 20, title: 'Open window 1'
});
openWin1Button.addEventListener('click', function() {
    var win1 = Ti.UI.createWindow({ backgroundColor: 'green', title: 'Window 1' });

    var closeWin1Button = Ti.UI.createButton({
        top: 20, title: 'Close window 1'
    });
    closeWin1Button.addEventListener('click', function() {
        win1.close();
    });
    win1.add(closeWin1Button);

    win1.open();

});
baseWindow.add(openWin1Button);

var win2;
var openWin2Button = Ti.UI.createButton({
    top: 80, title: 'Open window 2'
});
openWin2Button.addEventListener('click', function() {
    if(!win2) {
        win2 = Ti.UI.createWindow({ backgroundColor: 'red', title: 'Window 2' });

        var closeWin2Button = Ti.UI.createButton({
            top: 20, title: 'Hide window 2'
        });
        closeWin2Button.addEventListener('click', function() {
            win2.hide();
        });
        win2.add(closeWin2Button);

        win2.open();
    }
    else {
        win2.show();
    }

});
baseWindow.add(openWin2Button);

baseWindow.open();