Rendering SyntaxEditor.ActiveView without highlighting

Hello, I'm trying to get a screenshot of the SyntaxEditor's text without highlighting styles, but with lexing color coding still intact. What is the best way to prepare the control? Here is my best guess for an editor in single-line mode, but the screenshot keeps coming out with the highlights still inside:

    Public ReadOnly Property Preview As RenderTargetBitmap
        Get
            Dim r As HighlightingStyleRegistry = editor.HighlightingStyleRegistry
            editor.HighlightingStyleRegistry = Nothing
            editor.InvalidateVisual()
            Dim v As EditorView = editor.ActiveView
            Dim bmp As New RenderTargetBitmap(2000, v.VisualElement.ActualHeight, 96, 96, PixelFormats.Pbgra32)
            v.VisualElement.Measure(New Size(2000, v.VisualElement.ActualHeight))
            v.VisualElement.Arrange(New Rect(0, 0, 2000, v.VisualElement.ActualHeight))
            bmp.Render(v.VisualElement)
            editor.HighlightingStyleRegistry = r
            Return bmp
        End Get
    End Property