app.js

// this sets the background color of the master UIView (when there are no windows/tab groups on it)
Titanium.UI.setBackgroundColor('#000');

var isAndroid = false;

if (Ti.Platform.name === 'android') {
	isAndroid = true;
}

// create tab group
var tabGroup = Titanium.UI.createTabGroup();

// create base UI tab and root window
var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});

var tab1 = Titanium.UI.createTab({  
    icon:'KS_nav_views.png',
    title:'Tab 1',
    window:win1
});

var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    backgroundColor:'#fff'
});

var tab2 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 2',
    window:win2
});

var win3 = Titanium.UI.createWindow({  
    title:'Tab 3',
    backgroundColor:'#fff'
});

var tab3 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 3',
    window:win3
});

var win4 = Titanium.UI.createWindow({  
    title:'Tab 4',
    backgroundColor:'#fff'
});

var tab4 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 4',
    window:win4
});

var win5 = Titanium.UI.createWindow({  
    title:'Tab 4',
    backgroundColor:'#fff'
});

var tab5 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 5',
    window:win5
});

var win6 = Titanium.UI.createWindow({  
    title:'Tab 5',
    backgroundColor:'#fff'
});

var tab6 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 6',
    window:win6
});

if (isAndroid) {
	var moreWin = Ti.UI.createWindow({
		title:'More',
		url:'more_window.js',
		backgroundColor:'#fff'
	});
	
	var moreTab = Ti.UI.createTab({
		icon:'KS_nav_ui.png',
		title:'More',
		window:moreWin
	});
}

//  add tabs
tabGroup.addTab(tab1);  
tabGroup.addTab(tab2);  
tabGroup.addTab(tab3);
tabGroup.addTab(tab4);

if (isAndroid) {
	tabGroup.addTab(moreTab);
} else {
	tabGroup.addTab(tab5);
	tabGroup.addTab(tab6);
}

// open tab group
tabGroup.open();

more_window.js

var win = Ti.UI.currentWindow;

var tabsData = [
	{title: 'Tab 5', hasChild: true, url: 'window5.js'},
	{title: 'Tab 6', hasChild: true, url: 'window6.js'}
];

var tabsTableView = Ti.UI.createTableView({
	data: tabsData
});

tabsTableView.addEventListener('click', function (e) {
	if (e.rowData.hasChild) {
		var newWin = Ti.UI.createWindow({
			title: e.rowData.title,
			url: e.rowData.url
		});
		
		Ti.UI.currentTab.open(newWin);	
	}
});

win.add(tabsTableView);