How to remove change track event handler?

Micro station Version : 08.05.01.25 Windows x86 (1990-2004 bently systems)

Programming Language :VBA

I'm using below code as class function in micro station v8 mvba tool.

Implements IChangeTrackEvents
Private Sub IChangeTrackEvents_BeginUndoRedo(ByVal AfterUndoRedo As Element, ByVal BeforeUndoRedo As Element, ByVal Action As MsdChangeTrackAction, ByVal IsUndo As Boolean)
End Sub
Private Sub IChangeTrackEvents_ElementChanged(ByVal AfterChange As Element, ByVal BeforeChange As Element, ByVal Action As MsdChangeTrackAction, CantBeUndone As Boolean)
    'my logic
End Sub
Private Sub IChangeTrackEvents_FinishUndoRedo(ByVal IsUndo As Boolean)
End Sub
Private Sub IChangeTrackEvents_Mark()
    'my logic
End Sub

i can using below command to trigger the above class function, 

Dim changeTrack As clsTrackEvents

Set changeTrack = New clsTrackEvents
AddChangeTrackEventsHandler changeTrack

it's working but i'm not able to remove the handler function of this class even i'm using below remove handler code,

RemoveChangeTrackEventsHandler changeTrack

so kindly suggest me, how to remove this change track event handler class function once I used.