VS2012 Press & Hold for Right Click.

[dunfiddlin]

You're allowing the message to pass through to the normal windows routines which are therefore undoing any changes you make.

Protected Overrides Sub WndProc(ByRef m As Message)
 Dim AllowNormalProcessing As Boolean = True
 
        If m.Msg = WM_TABLET_QUERYSYSTEMGESTURESTATUS Then
            'Call the GlobalAdd atom Function
            Dim atom As String = GlobalAddAtom("MICROSOFT_TABLETPENSERVICE_PROPERTY")
            'Call the setProc function
            SetProp(WindowHAndle, atom, TABLET_DISABLE_PRESSANDHOLD)
            GlobalDeleteAtom(atom)
 
            AllowNormalProcessing = False
 
        End If
 
        If m.Msg = WM_SYSCOMMAND And m.WParam.ToInt32 = SC_RESTORE Then
            SetWindowPos(taskBar, 0&, 0&, 0&, 0&, 0&, SWP_HIDEWINDOW)
 
           AllowNormalProcessing = False
 
        End If
 
        If AllowNormalProcessing Then MyBase.WndProc(m)
 
    End Sub