Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Timer1.Enabled = True
Timer2.Enabled = False
Timer3.Enabled = False
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Timer1.Enabled = False
Timer2.Enabled = True
Timer3.Enabled = False
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Timer1.Enabled = False
Timer2.Enabled = False
Timer3.Enabled = True
End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Me.Close()
End Sub

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Label1.Text = Label1.Text + 1
If Label1.Text > 10 Then
Label1.Text = 0
End If
End Sub

Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
Label2.Text = Label2.Text + 2
If Label2.Text > 10 Then
Label2.Text = 0
End If
End Sub

Private Sub Timer3_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer3.Tick
Label3.Text = Label3.Text + 3
If Label2.Text > 10 Then
Label2.Text = 0
End If
End Sub
End Class