Programmation du Touchpad : Cast invalide

Bonjour,
Je m'essaie à la programmation du Touchpad Synaptics sur VB 2010. J'ai suivi les directives du SDK, et j'ai importé 3 objets COM dans Form1 (SynAPI, SynDevice & SynPacket).

Tout se passe bien jusqu'à la réception du paquet. Pour résumer, on doit créer une procédure événementielle OnPacket, qui se déclenche chaque fois que l'utilisateur appuie sur le Touchpad. A partir de là, on réceptionne le packet, qui contient les informations telles que la position du doigt en X & Y, la pression exercée en Z, etc...

La procédure est bien appelée à chaque appui du pad, mais la réception du paquet déclenche une exception InvalidCast.

La ligne fautive est : AxSynDeviceCtrl1.LoadPacket(AxSynPacketCtrl1)
Impossible d'effectuer un cast d'un objet de type 'AxSYNCTRLLib.AxSynPacketCtrl' en type 'SYNCTRLLib.SynPacketCtrl'.

Je joins le code ci-dessous, vu qu'il n'est pas bien gros. J'ai essayé un CTYPE sur AxSynpacketCtrl1 mais ça ne donne rien.
Si quelqu'un a une idée svp, je suis preneur. Merci d'avance.

Code:

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Option Explicit On
Public Class Form1
    Public DeviceHandle As Integer, GetX As Integer, GetY As Integer, GetZ As Integer, ThirdXspan As Double, ThirdYspan As Double
    Public Ydigits As Object = {7, 4, 1}, Xmin As Integer, Ymin As Integer, Xmax As Integer, Ymax As Integer, GetButtonState As Integer
    Public ZTouchThreshold As Integer, dummy As Integer
    Public Const SE_ConnectionAny As SYNCTRLLib.SynConnectionType = 0
    Public Const SE_DeviceTouchPad As SYNCTRLLib.SynDeviceType = 2
    Public Const SP_DisableState As SYNCTRLLib.SynDeviceProperty = 268435825
    Public Const SP_IsTapEnabled As SYNCTRLLib.SynDeviceProperty = 268435789
    Public Const SP_ZTouchThreshold As SYNCTRLLib.SynDeviceProperty = 268435752
    Public Const SP_XLoSensor As SYNCTRLLib.SynDeviceProperty = 268435733
    Public Const SP_XHiSensor As SYNCTRLLib.SynDeviceProperty = 268435735
    Public Const SP_YLoSensor As SYNCTRLLib.SynDeviceProperty = 268435734
    Public Const SP_YHiSensor As SYNCTRLLib.SynDeviceProperty = 268435736
 
    Private Sub Form1_Activated(sender As Object, e As System.EventArgs) Handles Me.Activated
 
        AxSynAPICtrl1.Initialize()                          'initialize an ISynAPI instance
        AxSynAPICtrl1.Activate()                            'connect ISynAPICtrl events to the application's main message pump
        DeviceHandle = AxSynAPICtrl1.FindDevice(SE_ConnectionAny, SE_DeviceTouchPad, -1)  'query handle for a particular type of device or for a device connected
 
        If DeviceHandle = -1 Then
            MsgBox("Unable to find a Synaptics Touchpad")
            End
        End If
 
        AxSynDeviceCtrl1.Select(DeviceHandle)               'point an ISynDeviceCtrl instance to a particular physical device
        AxSynDeviceCtrl1.Activate()                         'connect ISynDeviceCtrl events to the application's main message pump
        AxSynDeviceCtrl1.Acquire(0)                         'acquire exclusive access to the device
        AxSynDeviceCtrl1.SetLongProperty(SP_DisableState, 0)                                    'enable Touchpad
        AxSynDeviceCtrl1.SetLongProperty(SP_IsTapEnabled, 0)                                    'disable Tap as left button click
        ZTouchThreshold = AxSynDeviceCtrl1.GetLongProperty(SP_ZTouchThreshold) + 20             'get Touchpad sensibility
 
        Xmin = AxSynDeviceCtrl1.GetLongProperty(SP_XLoSensor)
        Xmax = AxSynDeviceCtrl1.GetLongProperty(SP_XHiSensor)
        Ymin = AxSynDeviceCtrl1.GetLongProperty(SP_YLoSensor)
        Ymax = AxSynDeviceCtrl1.GetLongProperty(SP_YHiSensor)
 
        ThirdXspan = ((Xmax - Xmin) / 3) + 10 ^ -10          'calculate 1/3 of X span
        ThirdYspan = ((Ymax - Ymin) / 3) + 10 ^ -10          'calculate 1/3 of Y span
 
    End Sub
 
    Private Sub AxSynDeviceCtrl1_OnPacket(sender As System.Object, e As System.EventArgs) Handles AxSynDeviceCtrl1.OnPacket
        Dim Result As Object
 
        AxSynDeviceCtrl1.LoadPacket(AxSynPacketCtrl1)                'read the device packet queue and export packet data to an ISynPacketCtrl instance
        GetX = AxSynPacketCtrl1.X
        GetY = AxSynPacketCtrl1.Y
        GetZ = AxSynPacketCtrl1.Z
        GetButtonState = AxSynPacketCtrl1.ButtonState
 
    End Sub
 
    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
 
        AxSynDeviceCtrl1.Unacquire()
        AxSynDeviceCtrl1.Deactivate()
        AxSynDeviceCtrl1.SetLongProperty(SP_IsTapEnabled, 1)
        Me.Close()
    End Sub
 
End Class