Fullscreen android app with tabgroup

I have an android app with a tabgroup. The question is, if there is a way to make it fullscreen? In my tiapp.xml I currently have:

<statusbar-style>default</statusbar-style>
<statusbar-hidden>true</statusbar-hidden>
<fullscreen>true</fullscreen>
<navbar-hidden>true</navbar-hidden>

However, when the app loads, I still have the status bar at the top (the bar with current time, battery, and connection info).

Thank you for any help!

In your project folder:

platform
--android
----res
------values

create theme.xml:

<?xml version="1.0" encoding="utf-8"?> 
<resources>
    <style name="Theme.Titanium" parent="android:Theme.NoTitleBar">
        <item name="android:windowBackground">@drawable/background</item>
    </style>
</resources>

Have you tried something simple like adding navBarHidden: true to your window definition?

var win = Ti.UI.createWindow({
   navBarHidden: true,
   /* other params */
});