Window Service timer problem - VB.NET

I wrote a Windows Service application in VB.NET before and i faced a problem. I used timer to do the schedule task in this application. I dropped a Timer Control on the designer then add the Tick event to do the schedule task. I can built, install, stop and restart the service. However the problem is it the Tick event never fires at all.

After that, i try to use code to create the timer. I changed to use System.Timers.Timer instead of System.Windows.Forms.Timer dropped on the designer from Toolbox. Then it is work already. The code is like below:-

Dim timerSchedule As System.Timers.Timer

Protected Overrides Sub OnStart(ByVal args() As String)
timerSchedule = New System.Timers.Timer(1000)
AddHandler timerSchedule.Elapsed, AddressOf timerSchedule_Elapsed timerSchedule.Start() End Sub

Private Sub timerSchedule_Elapsed(ByVal pSender As Object, ByVal pArgs As System.Timers.ElapsedEventArgs)
Try timerSchedule.Stop()
'call my a function to do the scheduled task
DoScheduledTask()
Catch ex As Exception
Finally
timerSchedule.Start()
End Try End Sub

Try to know more about System.Timers Namespace, it will here you more.