Public Overridable Function onSetFilter( _
   ByVal _eventType As Integer, _
   ByVal eventCategories() As Integer, _
   ByVal lowSeverity As Integer, _
   ByVal highSeverity As Integer, _
   ByVal areaList() As String, _
   ByVal sourceList() As String _
) As Integer

public virtual int onSetFilter( 
   int _eventType,
   int[] eventCategories,
   int lowSeverity,
   int highSeverity,
   string[] areaList,
   string[] sourceList
)