text formatting

[John Allijn]

Hi,

I have a textfield where I want to present a chunk of text, formatted in a few different styles. 

This is what the text looks like:

---
On <timestamp>
<firstname> <Lastname> wrote:
<message text>
---

and this is how I like to represent it:

- the text "on timestamp" should be gray and 8 points
- the firstname and lastname should be 10 points, black and bold
- the message should be 16 points, blue, regular.
- put in a divider-line

The problem is that the message-text varies in length and that there may be multiple messages in the field. This means (but maybe I'm wrong) that I have to set the TextColor and TextSize properties while populating the field and that I cannot do this afterwards. 

So:
- How can I set the style of the text, put some text in the field and change the style again?
- how can I put in a horizontal line that separates the messages?

thank you for your thoughts!
John.