public class FaceCollection : ICollection, 
	IEnumerable, IEnumerable<Face>

Project.UndoContext.BeginUndoStep("FaceProperties");
try
{
    Station station = Station.ActiveStation;

    // Create a box.
    Part myPart = new Part();
    myPart.Name = "MyPart";
    station.GraphicComponents.Add(myPart);
    Body box = Body.CreateSolidBox(new Matrix4(Vector3.XVector, 0.0), new Vector3(0.1, 0.1, 0.1));
    box.Name = "MyBox";
    myPart.Bodies.Add(box);

    // Get a face from the box.
    Face myFace = box.Shells[0].Faces[0];

    // Make sure the face is visible.
    myFace.Visible = true;

    // Make the the face yellow.
    myFace.Color = Color.Yellow;

    // Output the name of the body of the face.
    Logger.AddMessage(new LogMessage("The body of the face is: " + myFace.Body.Name));

    // Traverse the loops of the face and output the number of coedges each has.
    int i = 1;
    foreach (Loop l in myFace.Loops)
    {
        Logger.AddMessage(new LogMessage("Loop number '" + i + "' has '" + l.Coedges.Count + "' coedges"));
        i++;
    }

    // Find the vertex closest to a point.
    Vector3 point = new Vector3(0.6, 0.6, 0.6);
    Vertex closestVert = myFace.FindClosestVertex(point);
    Logger.AddMessage(new LogMessage("The closest vertex to point is : (" + closestVert.Position.x.ToString() +
                                                                      ", " + closestVert.Position.x.ToString() +
                                                                      ", " + closestVert.Position.x.ToString() + ")"));

    // Create a surface circle.
    Matrix4 matrix_origo = new Matrix4(new Vector3(Axis.X), 0.0);
    Body circle = Body.CreateSurfaceCircle(matrix_origo, 0.5);
    circle.Name = "Surface circle";
    myPart.Bodies.Add(circle);

    if (circle.Shells[0].Faces[0].ReverseNormal())
    {
        Logger.AddMessage(new LogMessage("Face of surface circle succesfully reversed!"));
    }
    else
    {
        Logger.AddMessage(new LogMessage("Reversal of face of surface circle failed!"));
    }
}
catch
{
    Project.UndoContext.CancelUndoStep(CancelUndoStepType.Rollback);
    throw;
}
finally
{
    Project.UndoContext.EndUndoStep();
}