Adding a listbox control into PDF form document
listbox in PDF document generated with Bytescout.PDF
The example demonstrates how to create a listbox using ByteScout PDF SDK.

Program.vb:
VB

'*******************************************************************
'       ByteScout PDF SDK
'                                                                   
'       Copyright © 2016 Bytescout, http://www.bytescout.com        
'       ALL RIGHTS RESERVED                                         
'                                                                   
'*******************************************************************

Imports Bytescout.PDF

''' <summary>
''' This example demonstrates how to create a listbox.
''' </summary>
Class Program

    Shared Sub Main()

        ' Create new document
        Dim pdfDocument = New Document()
        pdfDocument.RegistrationName = "demo"
		pdfDocument.RegistrationKey = "demo"
        ' Add page
        Dim page = New Page(PaperFormat.A4)
        pdfDocument.Pages.Add(page)

        ' Add list box, add items and make it multi-selectable
        Dim listBox1 = New ListBox(20, 20, 120, 80, "listBox1")
        listBox1.Items.Add("Value 1")
        listBox1.Items.Add("Value 2")
        listBox1.Items.Add("Value 3")
        listBox1.Items.Add("Value 4")
        listBox1.Items.Add("Value 5")
        listBox1.MultiSelect = True
        ' Decorate listbox
        listBox1.Font = New Font(StandardFonts.Helvetica, 10)
        listBox1.FontColor = New ColorRGB(0, 0, 128)
        listBox1.BorderColor = New ColorRGB(0, 0, 128)
        listBox1.BackgroundColor = New ColorRGB(240, 240, 255)
        listBox1.BorderWidth = 2

        page.Annotations.Add(listBox1)

        ' Save document to file
        pdfDocument.Save("result.pdf")

        ' Cleanup 
		pdfDocument.Dispose()

        ' Open document in default PDF viewer app
        Process.Start("result.pdf")

    End Sub

End Class 

Program.cs:
C#

//*******************************************************************
//       ByteScout PDF SDK		                                     
//                                                                   
//       Copyright © 2016 ByteScout - http://www.bytescout.com       
//       ALL RIGHTS RESERVED                                         
//                                                                   
//*******************************************************************

using System.Diagnostics;
using Bytescout.PDF;

namespace ListBoxes
{
	/// <summary>
	/// This example demonstrates how to create a listbox.
	/// </summary>
	class Program
	{
		static void Main()
		{
			// Create new document
			Document pdfDocument = new Document();
			pdfDocument.RegistrationName = "demo";
			pdfDocument.RegistrationKey = "demo";
			// Add page
			Page page = new Page(PaperFormat.A4);
			pdfDocument.Pages.Add(page);

			// Add list box, add items and make it multi-selectable
			ListBox listBox = new ListBox(20, 20, 120, 80, "listBox1");
			listBox.Items.Add("Value 1");
			listBox.Items.Add("Value 2");
			listBox.Items.Add("Value 3");
			listBox.Items.Add("Value 4");
			listBox.Items.Add("Value 5");
			listBox.MultiSelect = true;
			// Decorate listbox
			listBox.Font = new Font(StandardFonts.Helvetica, 10);
			listBox.BorderColor = new ColorRGB(0, 0, 128);
			listBox.BackgroundColor = new ColorRGB(240, 240, 255);
			listBox.BorderWidth = 2;

			page.Annotations.Add(listBox);
			
			// Save document to file
			pdfDocument.Save("result.pdf");

			// Cleanup 
			pdfDocument.Dispose();

			// Open document in default PDF viewer app
			Process.Start("result.pdf");
		}
	}
}