[TIMOB-23366] Windows: Hardware back button exits app instead of closing window inside tab

var colors = ['blue', 'gray', 'red'];

function createWindow(depth) {

    var win = Ti.UI.createWindow({
        layout: 'vertical',
        backgroundColor: colors[depth % colors.length]
    });

    win.add(Ti.UI.createLabel({
        text: 'Depth ' + depth
    }));

    var openBtn = Ti.UI.createButton({
        top: 20,
        title: 'Open Child'
    });

    openBtn.addEventListener('click', function () {
        tabA.open(createWindow(depth + 1));
    });

    win.add(openBtn);

    if (depth > 0) {
        var closeViaWinBtn = Ti.UI.createButton({
            top: 20,
            title: 'Close via Window'
        });

        closeViaWinBtn.addEventListener('click', function () {
            win.close();
        });

        win.add(closeViaWinBtn);

        var closeViaTabBtn = Ti.UI.createButton({
            top: 20,
            title: 'Close via Tab'
        });

        closeViaTabBtn.addEventListener('click', function () {
            tabA.close(win);
        });

        win.add(closeViaTabBtn);

        var backViaWinButton = Ti.UI.Windows.createAppBarButton({
            icon: Ti.UI.Windows.SystemIcon.BACK
        });

        backViaWinButton.addEventListener('click', function () {
            win.close();
        });

        var backViaTabButton = Ti.UI.Windows.createAppBarButton({
            icon: Ti.UI.Windows.SystemIcon.BACKTOWINDOW
        });

        backViaTabButton.addEventListener('click', function () {
            tabA.close(win);
        });

        win.add(Ti.UI.Windows.createCommandBar({
            items: [backViaWinButton, backViaTabButton]
        }));
    }

    return win;
}

var tabA = Ti.UI.createTab({
    title: 'Tab A',
    window: createWindow(0)
});

var tabB = Ti.UI.createTab({
    title: 'Tab B',
    window: Ti.UI.createWindow({
        backgroundColor: 'green'
    })
});

Ti.UI.createTabGroup({
    tabs: [tabA, tabB]
}).open();