I have this code with a window which has a bg. When i open up the window it bunches up the bg by the toolbar. The question is can i make the toolbar transparent so this does not happen?

var a = Titanium.UI.createButton({
title:'Good Tip',
width:100,
style:Titanium.UI.iPhone.SystemButtonStyle.BORDERED
});

a.addEventListener('click',
function(e)
{
goodtip(win.TipTitle);

});

var b = Titanium.UI.createButton({
title:'Bad Tip',
width:100,
style:Titanium.UI.iPhone.SystemButtonStyle.BORDERED
});

b.addEventListener('click',
function(e)
{
badtip(win.TipTitle);

});

var flexSpace = Titanium.UI.createButton({
systemButton:Titanium.UI.iPhone.SystemButton.FLEXIBLE_SPACE,
});
var fixedSpace = Titanium.UI.createButton({
systemButton:Titanium.UI.iPhone.SystemButton.FIXED_SPACE,
width:50
});
win.setToolbar([flexSpace,a,fixedSpace,b,flexSpace]);