I've got a FlowDocument generating a document for a client, and it's getting a line break that they don't like. Is there any way to mark a section of text that it should avoid line breaks? Something like this:

```
<Paragraph>Here is a paragraph where there should be <span NoLineBreak=True>no line break</span> in a certain part.</Paragraph>

```

Obviously, a Span doesn't have a NoLineBreak property, but I'm wondering if there's some equivilant functionality available, or if someone can get me started on a way of implementing a SpanWithNoLineBreak class or RunWithNoLineBreak class?

**UPDATE**
Actually, one issue I'm having is with a percent sign, where there isn't even a space:

```
<Paragraph>When I print and &#x00BD;% I want the one-half and '%' symbols to not line break between them.</Paragraph>

```

The & #x00BD; is the unicode for a ½ symbol. I'm getting a line wrap between the 1/2 and the % even though there's no space between them.