Menu problem

Hi,

I have implemented something like this. But it will show invalidateOptionsMenu error. Help me if anything wrong. I have test it in android version 3.0 and above.

index.xml

<Alloy>
    <Window id="win" fullscreen="true" onOpen="doOpen">
        <Menu id="menu" platform="android">
            <MenuItem id="menuItem" title="Item 1" icon="item1.png" onClick="doClick" showAsAction="Ti.Android.SHOW_AS_ACTION_IF_ROOM" />
        </Menu>
    </Window>
</Alloy>

function doClick(e) {
    Ti.API.info("Menu item clicked: " + e.source.title);
}
 
function doOpen(e) {
    $.win.invalidateOptionsMenu();
}