Hi,

if you have at least .NET 2.0 (generics) at your disposal, you could try to
use Generic List typed to Employee instead of ArrayList. I have VS2008, and
following code worked pretty fine with it (Intellisense suggests only
Employee control as child elements to CollectionEmployee)

If you use VS2005, the System.Linq etc namespace imports won't work for you

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI;

namespace WebApplication2
{
   public class Employee : WebControl
   {
       public string Name
       {
           get;
           set;
       }

       protected override void Render(System.Web.UI.HtmlTextWriter writer)
       {
           //as an example just writing the name out
           writer.RenderBeginTag(HtmlTextWriterTag.Span);
           writer.Write(Name);
           writer.RenderEndTag();
       }
   }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
   [ParseChildren(typeof(Employee),DefaultProperty="Employees",ChildrenAsProperties=true)]
   public class CollectionEmployee : WebControl, INamingContainer
   {
       private List<Employee> _employees = null;
       public List<Employee> Employees
       {
           get
           {
               if (_employees == null)
                   _employees = new List<Employee>();

               return _employees;
           }
       }

       protected override void CreateChildControls()
       {
           base.CreateChildControls();
           foreach (Employee e in Employees)
           {
               Controls.Add(e);
               Controls.Add(new LiteralControl("Something here"));
           }
       }
   }
}