Android tabgroup opens on top of main window

• app: android mobile
• sdk 3.1.2
• os: osx mavericks
• studio Titanium Studio, build: 3.1.3.201309132423
• output: Android emulator WXGA800 7in tablet

I have a simple 3-tab tabgroup that works as intended on iOS. However, when the app launches in Android, I see the home window briefly, but then it's covered over by the opening tabgroup. Once startup completes, I just see the tabgroup and a black screen where the window should be. The remaining two tabs display their child windows as intended.

index.js

$.index.open();

index.xml

<Alloy>
    <TabGroup>
        <Require src="homeView"/>       
        <Require src="venue"/>
        <Require src="cuisine"/>
    </TabGroup> 
</Alloy>

homeView.js

function openView(childView) {
 
    if (childView) {
        controller = Alloy.createController(childView);
        $.homeTab.open(controller.getView());
    }
}
 
$.homeButtonGrid.init({
    buttons : [{
        id : 'register',
        title : "Register",
        backgroundColor : "#009900",
        backgroundSelectedColor : "#006b00",
        click : function(e) {
            openView('registerView');
        }
    }, {
        id : 'login',
        title : "Login",
        backgroundColor : "#ff0000",
        backgroundSelectedColor : "#990000",
        click : function(e) {
            openView('loginView');
        }
    }],
    buttonWidth : Alloy.isTablet ? 200 : 150,
    buttonHeight : Alloy.isTablet ? 200 : 75
});
$.homeView.open();

homeView.xml

<Alloy>
    <Tab id="homeTab" title="Home">
        <Window id="homeView">
            <ScrollView class="container" id="homeNav">
                <Require src="header" type="view" />
                <ImageView id="logo" />
                <Widget id="homeButtonGrid" src="com.appcelerator.buttongrid"/>         
            </ScrollView>
        </Window>
    </Tab>
</Alloy>

Anyone else have this experience? I have no idea how to troubleshoot such a problem. My adroid sdk knowledge is very limited. Here is the code involved in startup.