Android/iOS tabGroup orientation

app.js

Titanium.UI.setBackgroundColor('#000');

// 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'
});
win1.addEventListener('click', function(e){
	win1.orientationModes = [
			Titanium.UI.LANDSCAPE_LEFT,
			Titanium.UI.LANDSCAPE_RIGHT
		]; 
	// Deprecated as of 1.7.2 
	// Titanium.UI.orientation = Titanium.UI.LANDSCAPE_LEFT;
});

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

var label1 = Titanium.UI.createLabel({
	color:'#999',
	text:'I am Window 1',
	font:{fontSize:20,fontFamily:'Helvetica Neue'},
	textAlign:'center',
	width:'auto'
});

win1.add(label1);

//
// create controls tab and root window
//
var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    backgroundColor:'#fff'
});
win2.addEventListener('click', function(e){
	win2.orientationModes = [
			Titanium.UI.PORTRAIT
		]; 
	// Deprecated as of 1.7.2 
	// Titanium.UI.orientation = Titanium.UI.PORTRAIT;
});

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

var label2 = Titanium.UI.createLabel({
	color:'#999',
	text:'I am Window 2',
	font:{fontSize:20,fontFamily:'Helvetica Neue'},
	textAlign:'center',
	width:'auto'
});

win2.add(label2);

tabGroup.addTab(tab1);  
tabGroup.addTab(tab2);  

tabGroup.open();