private void gs_gridView_ItemClick(object sender, ItemClickEventArgs e)
        {
            ListItemDesktop lid = (ListItemDesktop)e.ClickedItem;

            if (lid != null)
            {
                string location = lid.li_fuelType.Tag.ToString() + "," +
                                  lid.li_brand.Tag.ToString();

                Frame.Navigate(typeof(MainPage), location);
            }
        }
        private void ShowDataOnList(string responseXml)
        {
            GasStations = GetItemList(responseXml);

            int items = GasStations.Count;

            list_title.Text = "Λίστα Πρατηρίων (" + items.ToString() + ")";

            foreach (GasStation gs in GasStations)
            {
                ListItemDesktop lid = new ListItemDesktop();

                lid.li_fuelType.Text = gs.FT;
                //Εισαγωγή του latitude και του longintude στα παιδία αυτά για χρήση αργότερα
                lid.li_fuelType.Tag = gs.LT;
                lid.li_brand.Tag    = gs.LG;

                if (gs.BR == "ΑΝΕΞΑΡΤΗΤΟ ΠΡΑΤΗΡΙΟ")
                {
                    lid.li_brand.Text = "ΑΠ";
                }
                else if (gs.BR == "ΑΙΓΑΙΟ (AEGEAN)")
                {
                    lid.li_brand.Text = "AEGEAN";
                }
                else
                {
                    lid.li_brand.Text = gs.BR;
                }

                lid.li_logo.Source   = new BitmapImage(CommonMethods.GetFuelStationIcon(gs.BR_ID));
                lid.li_price.Text    = gs.FT_PR + " €";
                lid.li_date.Text     = gs.FT_DT;
                lid.li_owner.Text    = gs.OW;
                lid.li_address.Text  = gs.AD;
                lid.li_distance.Text = "Απόσταση από πρατήριο: " + gs.DIS + " km";
                gs_gridViewDesktop.Items.Add(lid);
            }
        }