How can I see whether a scrollviewer child element is visible, and make it visible if it isn't?

In a scrollviewer I have a textblock with 1000 inlines e.g.


<TextBlock Name="textBlock1" TextWrapping="Wrap" />


public MainWindow()
for (int i = 0; i < 1000; i++)
textBlock1.Inlines.Add(new Run("Inline number " + i.ToString() + ". "));

How do I see if a particular inline element (e.g. number 850) is vis

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