[WPF/VB.net] Add event programmatically to hyperlink

I making on chat app with VB.net+WPF and I need hyperlinks in that. For chat log I using RichTextBox and I adding new paragraph every time when new message come. So problem is, when I add hyperlink in RichTextBox it's not work because need CLICK event.
So, when I manually insert in my RichTextBox this:

Code:

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<Hyperlink NavigateUri="http://www.google.com">Google</Hyperlink>

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And use this event:

Code:

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    Public Sub New()
        InitializeComponent()
        [AddHandler](Hyperlink.RequestNavigateEvent, New RoutedEventHandler(AddressOf OnNavigationRequest))
    End Sub

Public Sub OnNavigationRequest(ByVal sender As Object, ByVal e As RoutedEventArgs)
        Dim source = TryCast(e.OriginalSource, Hyperlink)
        If source IsNot Nothing Then
            Process.Start(source.NavigateUri.ToString())
        End If
    End Sub

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IT WORK !


But I need it programmatically
When I do it link this:

Code:

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Dim PARAGRAF As Paragraph = New Paragraph
        PARAGRAF.LineHeight = 1
        Dim r As New Run("stefanACM: ")
        r.FontFamily = New System.Windows.Media.FontFamily("/MY APP;component/Fonts/#Arial")
        r.FontSize = 14
        r.FontStyle = System.Windows.FontStyles.Normal
        r.FontWeight = System.Windows.FontWeights.Bold
        r.Foreground = bojaNick

        Dim r1 As New Run("test")
        r1.FontFamily = New System.Windows.Media.FontFamily("/MY APP;component/Fonts/#Arial")
        r1.FontSize = 14
        r1.FontStyle = System.Windows.FontStyles.Normal
        r1.FontWeight = System.Windows.FontWeights.Bold
        r1.Foreground = bojaText

        Dim r2 As New Run("HYPERLINK ")
        Dim h As New Hyperlink(r2)
        h.NavigateUri = New Uri("http://www.google.com")

        PARAGRAF.Inlines.Add(r)
        PARAGRAF.Inlines.Add(r1)
        PARAGRAF.Inlines.Add(h)

        txtLog.Document.Blocks.Add(PARAGRAF)

---

When I click on HYPERLINK nothing happen...

Can anybody help me with this. I think something stupid is problem but I am tired and can't find that :|

Thanks in advice

I can't believe...
I put transparent image over chat and that's why click event didn't activated :|

Now it's work...