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

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

    '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.
    Friend WithEvents Timer1 As System.Windows.Forms.Timer
    Friend WithEvents btnReset As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
        Me.btnReset = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Timer1
        '
        Me.Timer1.Interval = 10000
        '
        'btnReset
        '
        Me.btnReset.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.btnReset.Location = New System.Drawing.Point(696, 496)
        Me.btnReset.Name = "btnReset"
        Me.btnReset.Size = New System.Drawing.Size(72, 32)
        Me.btnReset.TabIndex = 0
        Me.btnReset.Text = "Reset"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(768, 526)
        Me.Controls.Add(Me.btnReset)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region
    Private Structure frmControl
        Dim btn As Button
        Dim lbl As Label
    End Structure

    Dim frmControls(9) As frmControl
    Dim WithEvents b As Button
    Dim l As Label

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.WindowState = FormWindowState.Maximized
        Dim xMove As Integer = Me.Width / 11
        Dim yMove As Integer = Me.Height / 11
        Dim location As New System.Drawing.Point(10, 10)

        For i As Integer = 0 To 9
            b = New Button
            If i = 0 Then
                b.Name = "btnHome"
                b.Text = "&Home"
                AddHandler b.Click, AddressOf btnHome_Click
            Else
                b.Name = "btn" & i
                b.Text = "&" & i
                b.Tag = i
                AddHandler b.Click, AddressOf btn_Click
            End If
            b.Location = location
            location.X += xMove
            location.Y += yMove
            b.Enabled = False

            Me.Controls.Add(b)
            frmControls(i).btn = b 'add reference
            l = New Label
            l.Location = b.Location
            l.Left += b.Width + 3
            Me.Controls.Add(l)
            frmControls(i).lbl = l
        Next
        hit(9) 'as if last hit button 10
    End Sub

    Dim t As Date
    Private Sub hit(ByVal index As Integer)
        If t.Ticks <> 0 Then
            Dim delta = Now.Subtract(t).Ticks
            frmControls(index).lbl.Text = FormatNumber(delta / 10000, 2)
        End If
        frmControls(index).btn.Enabled = False
        frmControls(0).btn.Enabled = True
        t = Now
    End Sub

    Private Sub btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Dim i As Integer = sender.tag
        hit(i)
    End Sub

    Private nextBtn As Integer
    Private Sub btnHome_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        t = Now
        nextBtn += 1
        If nextBtn > 9 Then nextBtn = 1
        frmControls(nextBtn).btn.Enabled = True
        frmControls(0).btn.Enabled = False
        Timer1.Enabled = True
    End Sub

    Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
        hit(9)
        nextBtn = 0
    End Sub
End Class