Auto clicker dur ikke

Hej jeg prøver at lave en auto clicker der trykker så længe man holder left mouse nedeher er min kode:

Imports System.Windows.Forms
Imports System.Runtime.InteropServices
Imports WindowsHook

Public Class Form1
    Dim WithEvents gmh As New MouseHook
    Declare Sub mouse_event Lib "user64" Alias "mouse_event" (ByVal dwFlags As Long, ByVal dx As Long, ByVal dy As Long, ByVal cButtons As Long, ByVal dwExtraInfo As Long)

    Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        Me.gmh.Dispose()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.gmh.InstallHook()
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Autoclick()
    End Sub
    Private Sub Autoclick()
        mouse_event(&H2, 0, 0, 0, 1)
        mouse_event(&H4, 0, 0, 0, 1)
    End Sub

    Private Sub MouseHook1_MouseDown(ByVal sender As Object, ByVal e As WindowsHook.MouseEventArgs) Handles MouseHook1.MouseDown
        Timer1.Start()
    End Sub

    Private Sub MouseHook1_MouseUp(ByVal sender As Object, ByVal e As WindowsHook.MouseEventArgs) Handles MouseHook1.MouseUp
        Timer1.Stop()
    End Sub

    Private Sub button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button1.Click
        TextBox1.Enabled = False
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Timer1.Interval = TextBox1.Text
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        TextBox1.Enabled = True
    End Sub
End Class

Jeg ved ikke hvad der er galt har både prøvet user32 og user64 mne ingen af dem dur jeg bruger også WindowsHookLib her http://www.vbforums.com/showthread.php?t=436321&highlight=mousehook men kan bare ikke finde ud af hvad der er galt har fundet tonvis a guider men ingen til bare at holde left mouse nede på forhånd tak :)