Remote App failed to launch using MSTSCLib API

Hi,

I am using MSRDPClient in a c# winform application and can't get to launch a remote app.
The following code is working for opening a desktop control if I comment out rdp.RemoteProgram.RemoteProgramMode = true;

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using AxMSTSCLib;

namespace SampleRDC
{
    public partial class Form1 : Form
    {
        // initialized in form1.Designer
        // private AxMSTSCLib.AxMsRdpClient7NotSafeForScripting rdp;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {

                rdp.Server = txtServer.Text;
                rdp.UserName = txtUserName.Text;

                rdp.OnConnected += new EventHandler(rdp_OnConnected);

                rdp.RemoteProgram.RemoteProgramMode = true;
                //rdp.RemoteProgram2.RemoteApplicationName = "Calculator";
                //rdp.RemoteProgram2.RemoteApplicationProgram = @"C:\Windows\system32\calc.exe";
                
                rdp.AdvancedSettings7.ClearTextPassword = txtPassword.Text;
                rdp.Connect();               

            }
            catch (Exception Ex)
            {
                MessageBox.Show("Error Connecting", "Error connecting to remote desktop " + txtServer.Text + " Error:  " + Ex.Message,MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        void rdp_OnConnected(object sender, EventArgs e)
        {

            rdp.RemoteProgram.ServerStartProgram(@"C:\Windows\system32\calc.exe", "", "", false, "", false);
        }
   }
}

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Trying to launch a remote app using :

rdp.RemoteProgram.RemoteProgramMode = true;
...
            rdp.RemoteProgram.ServerStartProgram(@"C:\Windows\system32\calc.exe", "", "", false, "", false);

nothing happens and the connected event is never fired.

The client dev environnment is VS 2010 on Windows 7 Pro SP1
The target environnement is WS2008R2,
The TS Server is WS2003

Thanks for helping me