Question: I am using a RichTextBox in WPF, and am trying to set the default paragraph spacing to 0 (so that there is no paragraph spacing). While I could do this in XAML, I would like to achieve it programmatically if possible. Any ideas?

Answer: 
```
RichTextBox rtb = new RichTextBox();
rtb.SetValue(Paragraph.LineHeightProperty, 1.0);

```
I know this question was posted before I even started coding but I found that simply setting `ShowSelectedMargin` to `true` did the trick