http://blog.clearlyinnovative.com/post/7182213033/titanium-appcelerator-quickie-ipad-popover-with

app.js

var window = Titanium.UI.createWindow({
});

var popOver_button = Titanium.UI.createButton({
    title: "PopOver Button",
    width:150,
    height:35
})

window.add(popOver_button);

popOver_button.addEventListener('click', function() {

    var popover = Ti.UI.iPad.createPopover({
        width:400,
        height:300,
        arrowDirection:Ti.UI.iPad.POPOVER_ARROW_DIRECTION_ANY,
        navBarHidden:true,
    });

    // add navigationGroup to popOver
    var navigationGroup = createPopOverNavigationGroup( popover );
    popover.add(navigationGroup);

    popover.show({
        view:popOver_button,
        animated:true
    });

});
window.open();

/**
 * create the popover window when the user clicks the button
 */
function createPopOverNavigationGroup(popover) {

    // add close button to close the popover
    var close_button = Ti.UI.createButton({
        title:'Close'
    });
    close_button.addEventListener('click', function() {
        popover.hide({
            animated:true
        });
    });
    var win1 = Titanium.UI.createWindow({
        title: "NavGroup In Popover",
        backgroundColor:'#fff',
        barColor:'black'
    });
    win1.rightNavButton = close_button;

    // create a table with some rows to click, a pretty common use of navGroup
    var tableView = Titanium.UI.createTableView({
        width:'100%',
        height:'100%',
        rowHeight: 'auto',
        barColor:'black',
        data:[{
            title:"Row1"
        },{
            title:"Row2"
        }]
    });
    win1.add(tableView);

    // create the navigationGroup
    var navGroup = Ti.UI.iPhone.createNavigationGroup({
        window : win1
    });

    // event listener for  the clicks
    tableView.addEventListener('click', function(e) {

        // create window when row is clicked and show title of row
        var detailWindow = Ti.UI.createWindow({
            barColor:'black',
            title : "Detail Window",
            backButtonTitle:"Back",
        });

        // label to show the title
        var label = Titanium.UI.createLabel({
            text: "Clicked " + e.row.title,
            width:'100%',
            color:'white',
            height:35,
            textAlign:'center'
        })
        detailWindow.add(label);

        // open the window using the navGroup
        navGroup.open(detailWindow);
    });
    return navGroup;
}