Pushpiny w Bing Maps

Mam taki kod serwera:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Threading;
using Microsoft.Maps.MapControl.WPF;
using BingMapsWinForm;

namespace testserver
{
    public partial class Form1 : Form
    {

        public static Socket s;
        public static Socket cli;
        public Thread srv;
        public Thread klient;
        public int counter = 0;
        delegate void SetTextCallback(string text);
        

        public Form1()
        {
            InitializeComponent();
            
            mapUserControl1.MyMap.CredentialsProvider = new ApplicationIdCredentialsProvider("ydugsyugkhi34y34ugui43g42hidy7siuh");

           

            s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Unspecified);
            s.Bind(new IPEndPoint(IPAddress.Parse(tb_IP.Text), Convert.ToInt32(tb_port.Text)));
            s.Listen(5);
            if (s.IsBound)
            {
                srv = new Thread(new ThreadStart(this.start_server));
                srv.Start();

            }
            else
            {
                SetText(".");
            }

            
            
           
        }
        void start_server()
        {
            while (true)
            {
                Socket cli = s.Accept();
                counter++;
                this.SetText("Polaczono z klientem nr " + counter);
                mapUserControl1.AddPushpin(new Location(0,0),"k","kk");
                
                
                

                klient = new Thread(new ParameterizedThreadStart(this.new_client));
                klient.Start(cli);
            }
        }

        void new_client(object o)
        {
            Socket cli = (Socket)o;
            mapUserControl1.AddPushpin(new Location(0, 0), "k", "kk");
            while (cli.IsBound)
            {

                try
                {
                    byte[] buffer = new byte[1024];
                    int wynik = cli.Receive(buffer);
                    if (wynik == 0)
                    {
                        cli.Close();
                        break;
                    }
                    String time = Encoding.ASCII.GetString(buffer, 0, wynik);
                    this.SetText("Client >> " + time);

        
                        String respond = time;
                        byte[] responddata = Encoding.ASCII.GetBytes(respond.ToString());
                        wynik = cli.Send(responddata);


                    
                     if (wynik == 0)
                    {
                        cli.Close();
                        break;
                    }
                    
                }
                catch { }
            }
                 

        }

        private void SetText(string text)
        {
            if (this.rtb_comm.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {
                this.rtb_comm.Text += text + (char)0x0D;
            }
        }

        //private void AddPin(
        

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            Environment.Exit(0);
        }


        

        
        
     
    }
}

a to kod kontrolki mapy:

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Maps.MapControl.WPF;

namespace BingMapsWinForm
{
    /// <summary>
    /// Interaction logic for MapUserControl.xaml
    /// </summary>
    public partial class MapUserControl : UserControl
    {
        public MapUserControl()
        {
            InitializeComponent();
            
        }

        private void PanMap_Click(object sender, RoutedEventArgs e)
        {
            Button b = sender as Button;
            Point p;

            MyMap.TryLocationToViewportPoint(MyMap.Center, out p);

            if (p != null)
            {
                switch (b.Tag as string)
                {
                    case "Up":
                        p.Y -= 50;
                        break;
                    case "Down":
                        p.Y += 50;
                        break;
                    case "Left":
                        p.X -= 50;
                        break;
                    case "Right":
                        p.X += 50;
                        break;
                }

                Microsoft.Maps.MapControl.WPF.Location l;
                MyMap.TryViewportPointToLocation(p, out l);
                MyMap.SetView(l, MyMap.ZoomLevel);
            }
        }

        public void AddPushpin(Location latlong, string title, string description)
        {
            Pushpin p = new Pushpin()
            {
                Location = latlong,
                Tag = new Metadata()
                {
                    Title = title,
                    Description = description
                }
            };

            p.MouseDown += PinClicked;

            DataLayer.Children.Add(p);
        }

        private void PinClicked(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            Pushpin p = sender as Pushpin;
            Metadata m = (Metadata)p.Tag;

            //Ensure there is content to be displayed before modifying the infobox control
            if (!String.IsNullOrEmpty(m.Title) || !String.IsNullOrEmpty(m.Description))
            {
                InfoboxTitle.Text = m.Title;
                InfoboxDescription.Text = m.Description;

                Infobox.Visibility = Visibility.Visible;

                MapLayer.SetPosition(Infobox, p.Location);
            }
        }

        private void CloseInfobox_Click(object sender, RoutedEventArgs e)
        {
            Infobox.Visibility = System.Windows.Visibility.Collapsed;
        }

        /// <summary>
        /// Simple class for storing pushpin information
        /// </summary>
        public struct Metadata
        {
            public string Title;
            public string Description;
        }
    }
}

w metodzie start_server chce dodać do kontrolki nowego pushpina kiedy podłączy się nowy klient. Nie mogę tego jednak zrobić bo wyskakuje błąd w momencie podłączenia klienta: "Wątkiem wywołującym musi być STA, ponieważ wiele składników interfejsów użytkownika go wymaga." Co robić? Pomóżcie dobrzy ludzie:P