Adjusting MovieClip height with ActionScript- What am I missing here?

I have a vertical line in a Movie Clip. On my stage the height is 55, but when I compile and trace its _height, it returns 57.

I found that the line's thickness has something to do with this. When the thickness is 2, the height of the line on the stage increases by 2 when I compile the movie, and when the thickness is 5 the height increases by 5, etc. It's as though the line's height is determined using: (Line Height When Compiled) = (Line height on the stage)+(thickness of line).

Am I missing something here? Please let me know what I'm doing wrong. This is bizarre. If I need to explain better let me know. Thanks!

What code are you using?

Not much code involved here, just using

Code:

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trace(myMC._height);

---

to get the height of the object. On the stage the height is 55 (in the object properties), but when compiled it's 57 (from the trace).

This is very odd, but will this have an effect on your project?

Yes, it's making my project much more difficult. I have 2 lines, each its own MC. Imagine one is vertical and the other is horizontal. I am trying to make the horizontal line line up with the bottom of the vertical line using

Code:

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horizLine._x = vertLine._x;
horizLine._y = vertLine._y + vertLine._height;

---

but when I compile there is a gap between the bottom of the vertical line and the horizontal line. The longer I make the vertical line (using vertLine._height = some number) the more pronounced this gap becomes. The horizontal line should be touching the bottom of the vertical line at all times.

I put the FLA on my server for download here.