Is there any way to style a tabGroup and tabs? TI 2.0

Hi, is there any way to style a tabGroup and tabs? The only thing I've been able to do is set the icon on a tab. I'd like to use background images for the tabGroup and tabs.

iOS simulator IOS 4.3 Titanium 2.0

var tabGroup = Titanium.UI.createTabGroup({ backgroundColor:'#ccc', backgroundImage:'images/tabgroup_bg.png' });

// create base UI tabs and  windows

var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});
var tab1 = Titanium.UI.createTab({  
    icon:'images/nav1.png',
backgroundImage:'images/tab_bg.png'
    window:win1
});