Beginner problem

Hi guys, I've the following files: CreateDevice.cs Vertex.cs CreateDevice.cs ----------------------------------

class CreateDevice : Form
...
PresentParameters presentParams = new PresentParameters();
presentParams.Windowed = true;
presentParams.SwapEffect = SwapEffect.Discard;
m_xRenderDevice = new Device (0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams);
...

public virtual void Render ()
{
      if (m_xRenderDevice == null)
        return;

      // Clear the backbuffer to a blue color 
      m_xRenderDevice.Clear (ClearFlags.Target, System.Drawing.Color.Black, 1.0f, 0);
      // Begin the scene
      m_xRenderDevice.BeginScene();
      //End the scene
      m_xRenderDevice.EndScene();
      m_xRenderDevice.Present();

Vertex.cs ----------------------------------

Class Vertex : CreateDevice
{
...
   public Vertex ()
    {
      m_xCreateDevice = new CreateDevice ();
    }

    public bool InitGraphics ()
    {
      if (m_xCreateDevice.InitializeGraphics ())
      {
        m_xRenderDevice = m_xCreateDevice.RenderDevice;
        OnCreateDevice (m_xRenderDevice, null);
        return true;
      }

      return false;
}

    public override void Render ()
    {
      if (m_xRenderDevice == null)
        return;

      // Clear the backbuffer to a blue color 
      m_xRenderDevice.Clear (ClearFlags.Target, System.Drawing.Color.Black, 1.0f, 0);
      // Begin the scene
      m_xRenderDevice.BeginScene ();
      m_xRenderDevice.SetStreamSource (0, m_xVertexBuffer, 0);
      m_xRenderDevice.VertexFormat = CustomVertex.TransformedColored.Format;
      m_xRenderDevice.DrawPrimitives (PrimitiveType.TriangleList, 0, 1);      
      //End the scene
      m_xRenderDevice.EndScene ();
      m_xRenderDevice.Present ();
    }

If I write the code of Vertex.cs in CreateDevice.cs I make a beautiful triangle otherwise if I leave the code of Vertex.cs in this file the Form is not Rendered... Does anyone know why? tnx Here you can find the project in VS 2003 http://it.geocities.com/salvodifazio/littlEngine.zip