<ScriptableMember()> _
    Public Event Chunk As EventHandler(Of VideoEventArgs)

<ScriptableType()> _
    Public Class VideoEventArgs
        Inherits EventArgs
        Public Property StriemVideo() As Byte()
            Get
                Return StriemVideo
            End Get
            Set(ByVal value As Byte())
                StriemVideo = value
            End Set
        End Property
        Public Property Index() As Long  
            Get
                Return Index
            End Get
            Set(ByVal value As Long)
                Index = value
            End Set
        End Property
    End Class

    Private Sub WriteChunk(ByVal sender As Byte())
        RaiseEvent Chunk(Me, New VideoEventArgs() With {.StriemVideo = sender, .Index =  0 })
    End Sub

..............................................................
       function onChunk(sender, e) {
            alert("1234567890");
        }
.............................................................
<param name="Chunk" value="onChunk" />
...........................................................

..............................................................
       function onChunk(sender, e) {
            alert("1234567890");
        }
.............................................................
<param name="Chunk" value="onChunk" />
...........................................................