[AS3] Animated Text Effect Problem

[Cortana]

Here's one for y'all.

In the game I'm creating I'm trying to acheive a animated typing effect. I've written a class for this purpose.

It works fine but there is one problem. As you know, text renderers try to fill as much of the current line as possible before starting on the next line.

This is what visibly happens in my case. To illustrate the problem go to here:
http://www.fatal-exception.co.uk/test/index.htm

When you open the example click the blue box to see the example. You can keep clicking or pressing keys on the stage to show the issue.

Has anyone faced this issue and/or know/read about a solution to this sort of issue?

Thanks.