[TIMOB-15469] iOS: Ability to remove glossy effect in the tab group

var win_1 = Ti.UI.createWindow({title: 'First Tab', backgroundColor: "white"}),
	win_2 = Ti.UI.createWindow({title: 'Second Tab', backgroundColor: "white"});


var tabGroup = Titanium.UI.createTabGroup({
   //tabsBackgroundColor: "red" // some new color
});

var tab_1 = Titanium.UI.createTab({  
    icon: 'nav_ui.png',
    title: 'First Tab',
    window: win_1
});

var tab_2 = Titanium.UI.createTab({  
    icon: 'nav_ui.png',
    title: 'Second Tab',
    window: win_2
});


tabGroup.addTab(tab_1);
tabGroup.addTab(tab_2);

tabGroup.open();