...
    /// <summary>
    /// Class overrides from the SODesigner class
    /// </summary>
    public class SimpleDesignerExample : SODesigner
    {
...
        /// <summary>
        /// Overriding the RunDesigner method.
        /// This method will be run by the framework to make the design.
        /// </summary>
        public override void RunDesigner()
        {
	    // It is important that you run the base designer
	    base.RunDesigner();

            // Adding a structure and two beams with the designer
            SOComponent structure = new SOComponent("structure");

            this.CurrentDesignAlternative.AddComponent(structure);
            structure.AddPart(new Beam_HE200A());
            structure.AddPart(new Beam_HE200A());
        }
    }
...

/// Copyright 2012-2013 Delft University of Technology, BEMNext Lab and contributors
/// 
///    Licensed under the Apache License, Version 2.0 (the "License");
///    you may not use this file except in compliance with the License.
///    You may obtain a copy of the License at
/// 
///        http://www.apache.org/licenses/LICENSE-2.0
/// 
///    Unless required by applicable law or agreed to in writing, software
///    distributed under the License is distributed on an "AS IS" BASIS,
///    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
///    See the License for the specific language governing permissions and
///    limitations under the License.
/// 

/// This file implements the Grasshopper component for the simple designer

/// Note the inclusion of the Grasshopper framework in the reference
using SustainabilityOpen.Grasshopper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

/// The namespace can be whatever you want it to be
namespace SimpleComponentsExample
{
    /// <summary>
    /// The component class implements the SODesigner_Component class
    /// </summary>
    public class SimpleDesignerExample_Component : SODesigner_Component
    {
        /// <summary>
        /// Constructor
        /// </summary>
        public SimpleDesignerExample_Component()
            : base("SimpleDesigner", "SimpleDesigner", "Register a simple designer", new SimpleDesignerExample())
        {
        }
										        /// <summary>
        /// You will need to override this method to register the inputs for the designer.
        /// </summary>
	/// <param name="pManager">Grasshopper's input parameter manager</param>
	protected override void RegisterInputParams(Grasshopper.Kernel.GH_Component.GH_InputParamManager pManager)
	{
	    base.RegisterInputParams(pManager);
	}
	
	/// <summary>
	/// You will need to override this method to register the outputs for the designer.
	/// </summary>
	/// <param name="pManager">Grasshopper's output parameter manager</param>
	protected override void RegisterOutputParams(Grasshopper.Kernel.GH_Component.GH_OutputParamManager pManager)
	{
	    // Note that you will need to call the RegisterOutputParams method of the base class to register the default output parameters.
	    base.RegisterOutputParams(pManager);   
	}
	
	/// <summary>
	/// You will need to override this method to solve the component.
	/// </summary>
	/// <param name="DA">Grasshopper's DataAccess interface</param>
	protected override void SolveInstance(Grasshopper.Kernel.IGH_DataAccess DA)
	{
	    /// Note that you will need to call the SolveInstance method of the base class to process the default parameters and connect them to the framework.
	    base.SolveInstance(DA);
	}
	
	/// <summary>
	/// You will need to override this Guid with an unique identifier for each class.
	/// </summary>
	public override Guid ComponentGuid
	{
	    get { return new Guid("{303EAE03-EAFF-4379-ACFD-9ABAE9289E6D}"); }
	}
    }
}