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public class ProgramTEST
{
     public ProgramTEST()
     {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MyApplicationContext(new string[] {})); // -->Hier bleibt es stehen
     }

     public ControlTester buttonTester;

     public void Test()
     {
        buttonTester = new ControlTester("_okButton", "myForm");

        buttonTester.FireEvent("Click");
     }
}                    

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MyMainForm myForm = new MyMainForm();
myForm.ShowDialog();                    

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public ProgramTEST()
{
    ApplicationTestStart _applicationTestStart = new ApplicationTestStart();
    ThreadStart ts = new ThreadStart(_applicationTestStart.Run);
    Thread t1 = new Thread(ts);
    t1.Start();
}                    

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public class ApplicationTestStart
{
    public ApplicationTestStart()
    {
    }

    public void Run()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(fals e);
        Application.Run(new MyApplicationContext(new string[] {}));
    }
}