C#

// This sets up the P/Invoke to make a call to an external library, like Win32
[DllImport("user32.dll"), EntryPoint = "SetParent", SetLastError = true)]
private static extern IntPtr SetParent(IntPtr hwndChild, IntPtr hwndParent);
 
 
    ...
    // Launch the .EXE...
    Process p = Process.Start("MyShockwave.EXE");
 
    // Wait for the .EXE to create its window and start looking for input
    p.WaitForInputIdle();
 
    // Assign the main window of the .EXE a new parent window
    SetParent(p.MainWindowHandle, myPanel.Handle);
    ...

public class GenericListBox<T> : Control
  where T : ListControl
{
   public GenericListBox(data...)
   {
      T innerControl;

      if (typeof(T) == typeof(MyListBox))
        innerControl = new MyListBox(data);
      else if (typeof(T) == typeof(MyCheckedListBox))
        innerControl = new MyCheckedListBox(data);
      else
        throw new ArgumentException("Some descriptive error message");

      innerControl.Dock = DockStyles.Fill;
      this.Controls.Add(innerControl);
   }
}

...

GenericListBox<MyListBox> ctl = new GenericListBox<MyListBox>(someData);

public static ListControl CreateListControl(MyControlTypes ctlType, DataObject data)
{
  if (ctlType == MyControlTypes.NormalListBox)
    return new MyListBox(data);
  else
    return new MyCheckedListBox(data);
}