[TIMOB-16294] iOS: ToImage() functionality on TabbedBar/ButtonBar removes text of the selected tab in image

// 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 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 buttonbar = Titanium.UI.createButtonBar({
            left : 20,
            right : 20,
            height : 24,
            labels : [L('spc_1d'), L('spc_1m'), L('spc_3m'), L('spc_6m'), L('spc_1y'), L('spc_3y'), L('spc_5y')],
            style : Titanium.UI.iPhone.SystemButtonStyle.BAR,
            backgroundColor : '#86c037',
           index:3,
           font:{fontWeight:'bold'}
 });
        win1.add(buttonbar);

var button = Ti.UI.createButton({
    title:"click me",
    text:"click here",
    backgroundColor:'black',
    top:20
});
win1.add(button);
button.addEventListener("click",function(e){
    Ti.API.info("you got clicked");
    var imageFile = Ti.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory, 'test.png');
        imageFile.write(win1.toImage());
});

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

win2.add(label2);

//
//  add tabs
//
tabGroup.addTab(tab1);

tabGroup.addTab(tab2);

// open tab group
tabGroup.open();