2D outline digramming with auto-layout?

Hi. I'm trying to document some flash/actionscript stuff using the GraphViz 
auto-layout capabilities of OGP. I have two issues.

1) I tried to create my own Diagram Style by editing the 'Lines' style and 
deleting the huge lightbulb, replacing it with a normal line segment like the 
others. I made sure (in its outline) that it was all hierarchical. I saved it 
in my ~/Library/Application Support/OmniGraffle/Diagram Styles/ folder but am 
not seeing it in the Template Chooser. I'd like to re-apply it to my diagram 
(right now it's just the Lines style) but can't figure out how. Ideas?

2) The stuff I'm trying to document is a bunch of classes which are a mix of 
inheritance and composition. I'm trying to figure out a clear way to take 
advantage of both axes; for example, maybe reading left-to-right, you could 
see that the MasterController is composed of (or spawns) a MainMenu and a 
GameController, and that GameController is composed of a GoalManager, a 
Legend, and so forth.... and reading top-to-bottom you could see that the 
Legend class extends UIElement, which in turn extends HideableObject, which 
extends MovieClip... and so forth.

I'm not sure that OGP is suited to achieve goal #2 above, but I would 
certainly appreciate any suggestions.

Thanks,


Thom Brooks