private void tsmiNewDevice_Click(object sender, EventArgs e)
{
m_mutex.WaitOne();
addDeviceThread = new Thread(new ThreadStart(AddDeviceForm));
addDeviceThread.Name = "AddDeviceFormThread";
addDeviceThread.Start();
while (!addDeviceThread.IsAlive)
Thread.Sleep(10);
m_mutex.ReleaseMutex();
}