I'm trying to figure out how to make a SmartPart visible on my screen through
a SmartPartPlaceHolder. I have the following code (I don't have so much
understanding of CAB yet so there might be a few things wrong here and there
- I hope you can help and correct me):

//------ CABTest2 project -------------

//Program.cs
using System;

namespace CABTest2
{
   static class Program
   {
       [STAThread]
       static void Main()
       {
           new MainShell().Run();
       }
   }
}

//ProfileCatalog.xml
<?xml version="1.0" encoding="utf-8" ?>
<SolutionProfile xmlns="http://schemas.microsoft.com/pag/cab-profile" >
 <Modules>
   <ModuleInfo AssemblyFile="Module1.dll"/>
 </Modules>
</SolutionProfile>

//MainShell.cs
using System.Windows.Forms;
using Microsoft.Practices.CompositeUI;
using Microsoft.Practices.CompositeUI.WinForms;

namespace CABTest2
{
   class MainShell : FormShellApplication<WorkItem, MainForm>
   {
       protected override void AfterShellCreated()
       {
           base.AfterShellCreated();
           
           RootWorkItem.UIExtensionSites.RegisterSite(
               "MainMenu",
               Shell.MainMenuStrip);
           
           ToolStripMenuItem l_mi = new ToolStripMenuItem("File");
           RootWorkItem.UIExtensionSites["MainMenu"].Add(l_mi);
       }
   }
}

//MainForm.cs
using System.Windows.Forms;
using Microsoft.Practices.CompositeUI;

namespace CABTest2
{
   public partial class MainForm : Form
   {
       WorkItem m_root;
       
       [ServiceDependency]
       public WorkItem RootWorkItem
       {
           set
           {
               m_root = value;
           }
       }
       
       public MainForm()
       {
           InitializeComponent();
       }
   }
}

//MainForm.Designer.cs
namespace CABTest2
{
   partial class MainForm
   {
       /// <summary>
       /// Required designer variable.
       /// </summary>
       private System.ComponentModel.IContainer components = null;

       /// <summary>
       /// Clean up any resources being used.
       /// </summary>
       /// <param name="disposing">true if managed resources should be
disposed; otherwise, false.</param>
       protected override void Dispose(bool disposing)
       {
           if (disposing && (components != null))
           {
               components.Dispose();
           }
           base.Dispose(disposing);
       }

       #region Windows Form Designer generated code

       /// <summary>
       /// Required method for Designer support - do not modify
       /// the contents of this method with the code editor.
       /// </summary>
       private void InitializeComponent()
       {
           this.menuStrip1 = new System.Windows.Forms.MenuStrip();
           this.smartPartPlaceHolder1 = new
Microsoft.Practices.CompositeUI.WinForms.SmartPartPlaceholder();
           this.SuspendLayout();
           //
           // menuStrip1
           //
           this.menuStrip1.Location = new System.Drawing.Point(0, 0);
           this.menuStrip1.Name = "menuStrip1";
           this.menuStrip1.Size = new System.Drawing.Size(292, 24);
           this.menuStrip1.TabIndex = 0;
           this.menuStrip1.Text = "menuStrip1";
           //
           // smartPartPlaceHolder1
           //
           this.smartPartPlaceHolder1.BackColor =
System.Drawing.Color.Transparent;
           this.smartPartPlaceHolder1.Location = new
System.Drawing.Point(12, 126);
           this.smartPartPlaceHolder1.Name = "smartPartPlaceHolder1";
           this.smartPartPlaceHolder1.Size = new System.Drawing.Size(219,
66);
           this.smartPartPlaceHolder1.SmartPartName = "TestSmartPart";
           this.smartPartPlaceHolder1.TabIndex = 1;
           this.smartPartPlaceHolder1.Text = "TestSmartPart";
           //
           // MainForm
           //
           this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
           this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
           this.ClientSize = new System.Drawing.Size(292, 266);
           this.Controls.Add(this.smartPartPlaceHolder1);
           this.Controls.Add(this.menuStrip1);
           this.MainMenuStrip = this.menuStrip1;
           this.Name = "MainForm";
           this.Text = "Form1";
           this.ResumeLayout(false);
           this.PerformLayout();

       }

       #endregion

       private System.Windows.Forms.MenuStrip menuStrip1;
       private
Microsoft.Practices.CompositeUI.WinForms.SmartPartPlaceholder
smartPartPlaceHolder1;
   }
}

//-------------- Module1 project -----------------

//Module1Init.cs
using Microsoft.Practices.CompositeUI;

namespace Module1
{
   public class Module1Init : ModuleInit
   {
       WorkItem m_root;
       
       [ServiceDependency]
       public WorkItem RootWorkItem
       {
           set
           {
               m_root = value;
           }
       }
       
       public override void AddServices()
       {
           base.AddServices();
           
           //Add services programmatically here...
       }

       public override void Load()
       {
           base.Load();
           
           //Display the user-interface here or perform startup custom
logic...

           Module1WorkItem l_wi = m_root.WorkItems.AddNew<Module1WorkItem>();
           l_wi.Run();
       }
   }
}

//Module1WorkItem.cs
using Microsoft.Practices.CompositeUI;
using Module1;

namespace Module1
{
   public class Module1WorkItem : WorkItem
   {
       protected override void OnRunStarted()
       {
           base.OnRunStarted();

           MainUserControl csp =
SmartParts.AddNew<MainUserControl>("TestSmartPart");

           //MainUserControl l_uc = SmartParts.AddNew<MainUserControl>();
           //Workspaces["MyMainWorkspace"].Show(l_uc);
       }
   }
}

//MainUserControl.cs
using System.Windows.Forms;
using Microsoft.Practices.CompositeUI.SmartParts;

namespace Module1
{
   [SmartPart]
   public partial class MainUserControl : UserControl
   {
       public MainUserControl()
       {
           InitializeComponent();
       }
   }
}

NOTE that I also have set the SmartPartName