[TIMOB-6975] iOS: Allow toolbars in nav bar (currently always width 0)

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

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


//
// create base UI tab and root window
//

var b1 = Ti.UI.createButton({
	style:Ti.UI.iPhone.SystemButtonStyle.PLAIN,
	systemButton:Ti.UI.iPhone.SystemButton.DONE
});
var b2 = Ti.UI.createButton({
	style:Ti.UI.iPhone.SystemButtonStyle.PLAIN,
	systemButton:Ti.UI.iPhone.SystemButton.EDIT
});
var toolbar = Ti.UI.iOS.createToolbar({
	items:[b1, b2],
	width:'auto'
});

var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff',
    leftNavButton:toolbar
});
var label1 = Titanium.UI.createLabel({
	color:'#999',
	text:'I am Window 1',
	font:{fontSize:20,fontFamily:'Helvetica Neue'},
	textAlign:'center',
	width:'auto'
});
label1.addEventListener('click', function(e) {
	Ti.API.info('Yup!')
})

win1.add(label1);

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

// open tab group
tabGroup.open();