var win = Ti.UI.createWindow();

Titanium.Facebook.appid = "181219095251677";
Titanium.Facebook.permissions = ['publish_stream', 'read_stream', 'offline_access'];

var alertDialog = Titanium.UI.createAlertDialog({
    title : 'Facebook',
    message : 'You need to login with Facebook',
    buttonNames : ['Login Facebook']
});
alertDialog.addEventListener('click', function(e) {

    Titanium.Facebook.authorize();

});
alertDialog.show();

win.open();