public class GraphicComponentGroup : GraphicComponent, 
	IAttachableParent, IHasGraphicComponents

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

    // Create the GraphicComponentGroup.
    GraphicComponentGroup myGCGroup = new GraphicComponentGroup();
    myGCGroup.Name = "myGCGroup";

    // Add the GraphicComponentGroup to the GraphicComponents of the station.
    station.GraphicComponents.Add(myGCGroup);

    // Create a part.
    Part myPart1 = new Part();
    myPart1.Name = "MyPart1";

    // Create a box and add it to myPart1.
    Body box = Body.CreateSolidBox(new Matrix4(Vector3.XVector, 0.0), new Vector3(0.4, 0.4, 0.4));
    box.Name = "MyBox";
    myPart1.Bodies.Add(box);

    // Add myPart1 to myGCGroup.
    myGCGroup.GraphicComponents.Add(myPart1);

    // Create another part.
    Part myPart2 = new Part();
    myPart2.Name = "MyPart2";

    //Create a cylinder and add it to myPart2.
    Matrix4 origin = new Matrix4(new Vector3(0.5, 0.5, 0.5), 0.0);
    Body myCylinder = Body.CreateSolidCylinder(origin, 0.2, 1);
    myCylinder.Name = "myCylinder";
    myPart2.Bodies.Add(myCylinder);

    // Add myPart1 to myGCGroup.
    myGCGroup.GraphicComponents.Add(myPart2);

    // Create a third part.
    Part myPart3 = new Part();
    myPart3.Name = "MyPart3";

    // Create a box and add it to myPart3.
    Body box2 = Body.CreateSolidBox(new Matrix4(Vector3.XVector, 0.0), new Vector3(0.1, 0.1, 0.1));
    box2.Name = "MyBox_2";
    myPart3.Bodies.Add(box2);

    // Add myPart3 to the station.
    station.GraphicComponents.Add(myPart3);

    // Attach myPart3 to myGCGroup, mount it on top of the cylinder, using an offset matrix.
    if (myGCGroup.CanAttachChild(myPart3))
    {
        myGCGroup.Attach(myPart3, true, new Matrix4(new Vector3(0.0, 0.0, 1.0)));
    }
    else
    {
        Logger.AddMessage(new LogMessage("Could not attach myPart3 to myGCGroup"));
    }
}
catch
{
    Project.UndoContext.CancelUndoStep(CancelUndoStepType.Rollback);
    throw;
}
finally
{
    Project.UndoContext.EndUndoStep();
}