ScrollViewer and TextBlock doesn't have vertical scrollbar?

Your ScrollViewer will never display a scrollbar, since it's Height is 100, and the Height of the TextBlock is also 100. The text within the TextBlock is simply overflowing out of the bounds of the control without making the control larger. If you want the TextBlock to always fill the ScrollViewer then change the Height property on the TextBlock to MinHeight instead.

If you don't care that the TextBlock may be shorter than the ScrollViewer then just do away entirely with the Height property on the TextBlock .

Set Height=50 or less for scroll viewer and check.

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