Media button not responsive

Hi guys, I have a problem with my button to open Titanium.Media.openPhotoGallery() and Ti.Media.showCamera().

When I put this code in my index.js is all right:

var popoverView;
var arrowDirection;
 
$.sx.addEventListener('click',function(e){
        Titanium.Media.openPhotoGallery({
        success:function(event)
        {
            var isAvatar = true;
            var image = event.media;
 
            if(typeof imageAmount == 'undefined') { 
                isAvatar = false;
            }
 
            // Carica immagine su server
            var xhr = Titanium.Network.createHTTPClient();
 
            xhr.onerror = function(e)
            {   
                Ti.API.info('IN ERROR ' + e.error);
                Ti.App.fireEvent('AggiornaGallery');
            };
            xhr.onload = function()
            {
                Ti.API.info('IN ONLOAD ' + this.status + ' readyState ' + this.readyState);
                Ti.App.fireEvent('AggiornaGallery');
                //alert(this.responseText);
            };
            xhr.onsendstream = function(e)
            { 
                Ti.API.info('ONSENDSTREAM - PROGRESS: ' + e.progress);  
            };
 
            xhr.open('POST',linkdb+'upload.php');
 
            var params = {
                file:image,
                avatar:isAvatar,
                id: myaccount[0].id,
                username: myaccount[0].username,
                continent: myaccount[0].continent,
                country: myaccount[0].country,
                city: myaccount[0].city
            };
 
            xhr.send(params);   
        },
        cancel:function(){},
        error:function(error){},
 
    allowEditing:true,
    popoverView:popoverView,
    arrowDirection:arrowDirection,
    mediaTypes:[Ti.Media.MEDIA_TYPE_VIDEO,Ti.Media.MEDIA_TYPE_PHOTO],
    });
});

but if I try to to export it in a external js to include in my index it never oper my gallery or camera at the first click but I have to click on my button 2 times.... WHY?????

index.js

$.sx.addEventListener('click', _openGallery);
 
function _openGallery(){
    var openGallery = require('/JS/onGallery');
    var OpenGallery = new openGallery($.imageView);
}

var popoverView;
var arrowDirection;
 
function openGallery(imageView) {
 
    Titanium.Media.openPhotoGallery({
        success:function(event)
        {
            var isAvatar = true;
            var image = event.media;
 
            if(typeof imageAmount == 'undefined') {
                isAvatar = false;
            }
 
            // Carica immagine su server
            var xhr = Titanium.Network.createHTTPClient();
 
            xhr.onerror = function(e)
            {   
                Ti.API.info('IN ERROR ' + e.error);
                Ti.App.fireEvent('AggiornaGallery');
            };
            xhr.onload = function()
            {
                Ti.API.info('IN ONLOAD ' + this.status + ' readyState ' + this.readyState);
                Ti.App.fireEvent('AggiornaGallery');
                //alert(this.responseText);
            };
            xhr.onsendstream = function(e)
            { 
                Ti.API.info('ONSENDSTREAM - PROGRESS: ' + e.progress);  
            };
 
            xhr.open('POST',linkdb+'upload.php');
 
            var params = {
                file:image,
                avatar:isAvatar,
                id: myaccount[0].id,
                username: myaccount[0].username,
                continent: myaccount[0].continent,
                country: myaccount[0].country,
                city: myaccount[0].city
            };
 
            xhr.send(params);   
        },
        cancel:function(){},
        error:function(error){},
 
    allowEditing:true,
    popoverView:popoverView,
    arrowDirection:arrowDirection,
    mediaTypes:[Ti.Media.MEDIA_TYPE_VIDEO,Ti.Media.MEDIA_TYPE_PHOTO],
    });
};
 
module.exports = openGallery;

Regards, Matteo