Option Strict On
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents ComboBox2 As System.Windows.Forms.ComboBox
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents Label5 As System.Windows.Forms.Label
    Friend WithEvents TextBox3 As System.Windows.Forms.TextBox

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.Label3 = New System.Windows.Forms.Label()
        Me.Label4 = New System.Windows.Forms.Label()
        Me.Button2 = New System.Windows.Forms.Button()
        Me.ComboBox2 = New System.Windows.Forms.ComboBox()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.TextBox2 = New System.Windows.Forms.TextBox()
        Me.Button3 = New System.Windows.Forms.Button()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.Label5 = New System.Windows.Forms.Label()
        Me.TextBox3 = New System.Windows.Forms.TextBox()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(8, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(56, 16)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Name"
        '
        'Label2
        '
        Me.Label2.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.Location = New System.Drawing.Point(8, 64)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(56, 16)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "Address"
        '
        'Label3
        '
        Me.Label3.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label3.Location = New System.Drawing.Point(8, 107)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(56, 16)
        Me.Label3.TabIndex = 4
        Me.Label3.Text = "City"
        '
        'Label4
        '
        Me.Label4.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label4.Location = New System.Drawing.Point(264, 107)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(64, 16)
        Me.Label4.TabIndex = 7
        Me.Label4.Text = "Country"
        '
        'Button2
        '
        Me.Button2.Font = New System.Drawing.Font("Verdana", 11.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Button2.Location = New System.Drawing.Point(368, 184)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(104, 32)
        Me.Button2.TabIndex = 11
        Me.Button2.Text = "OK"
        '
        'ComboBox2
        '
        Me.ComboBox2.DropDownWidth = 56
        Me.ComboBox2.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.ComboBox2.Items.AddRange(New Object() {"ITALY", "SPAIN", "GREECE", "FRANCE", "GERMANY", "DENMARK"})
        Me.ComboBox2.Location = New System.Drawing.Point(336, 104)
        Me.ComboBox2.Name = "ComboBox2"
        Me.ComboBox2.Size = New System.Drawing.Size(136, 22)
        Me.ComboBox2.TabIndex = 8
        '
        'ComboBox1
        '
        Me.ComboBox1.DropDownWidth = 200
        Me.ComboBox1.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.ComboBox1.Items.AddRange(New Object() {"Athens", "Barcelona", "Berlin", "Frankfurt", "Lyon", "Milan", "Paris", "Rome"})
        Me.ComboBox1.Location = New System.Drawing.Point(72, 104)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(144, 22)
        Me.ComboBox1.Sorted = True
        Me.ComboBox1.TabIndex = 5
        '
        'Button1
        '
        Me.Button1.Font = New System.Drawing.Font("Tahoma", 9.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(224, 105)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(32, 21)
        Me.Button1.TabIndex = 6
        Me.Button1.Text = "..."
        '
        'TextBox2
        '
        Me.TextBox2.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox2.Location = New System.Drawing.Point(72, 24)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.Size = New System.Drawing.Size(312, 22)
        Me.TextBox2.TabIndex = 1
        Me.TextBox2.Text = ""
        '
        'Button3
        '
        Me.Button3.Font = New System.Drawing.Font("Verdana", 11.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Button3.Location = New System.Drawing.Point(8, 184)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(104, 32)
        Me.Button3.TabIndex = 12
        Me.Button3.Text = "Cancel"
        '
        'TextBox1
        '
        Me.TextBox1.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox1.Location = New System.Drawing.Point(72, 64)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(400, 22)
        Me.TextBox1.TabIndex = 3
        Me.TextBox1.Text = ""
        '
        'Label5
        '
        Me.Label5.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label5.Location = New System.Drawing.Point(8, 144)
        Me.Label5.Name = "Label5"
        Me.Label5.Size = New System.Drawing.Size(56, 32)
        Me.Label5.TabIndex = 9
        Me.Label5.Text = "Postal Code"
        '
        'TextBox3
        '
        Me.TextBox3.Font = New System.Drawing.Font("Verdana", 9.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.TextBox3.Location = New System.Drawing.Point(72, 144)
        Me.TextBox3.Name = "TextBox3"
        Me.TextBox3.Size = New System.Drawing.Size(80, 22)
        Me.TextBox3.TabIndex = 10
        Me.TextBox3.Text = ""
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(480, 221)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TextBox3, Me.Label5, Me.Button3, Me.Button2, Me.ComboBox2, Me.Label4, Me.Label3, Me.Label2, Me.Label1, Me.TextBox2, Me.TextBox1, Me.Button1, Me.ComboBox1})
        Me.Name = "Form1"
        Me.Text = "Flexible ComboBox Control"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim itm As String
        itm = InputBox("Enter new item", "New Item")
        If itm <> "" Then AddElement(itm)
    End Sub

    Private Sub ComboBox1_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.LostFocus
        Dim newItem As String = ComboBox1.Text
        AddElement(newItem)
    End Sub

    Sub AddElement(ByVal newItem As String)
        Dim idx As Integer
        If Not ComboBox1.Items.Contains(newItem) Then
            idx = ComboBox1.Items.Add(newItem)
        Else
            idx = ComboBox1.Items.IndexOf(newItem)
        End If
        ComboBox1.SelectedIndex = idx
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ComboBox1.SelectedIndex = 0
        ComboBox2.SelectedIndex = 0
    End Sub
End Class