Heap limits in OS X

The FAQ mentions tweaking the heap limits "in the command line." I'm famili=
ar with Java and command lines and -Xmx, but on OS X I don't actually *have=
* a command line, just

 ArgoUML.app/Contents/MacOS/JavaApplicationStub

Contents/Info.plist includes a dict key [Java][VMOptions] that contains an =
-Xmx value, so I changed that and restarted ArgoUML =E2=80=A6 but it doesn'=
t seem like the change had the expected effect: I set it to 1024M, but the =
little heap indicator in the bottom right of the main window is saying "503=
M used of 600M total" and showing a warning orange band.=20

I suppose a "warn at 500 for a limit of 600" is not unduly alarmist =E2=80=
=A6 but I gave it 1024, not just 600, why's it whining at me?

Should I have set this elsewhere? Should I adjust my execrations? Are there=
 things (like, say, extensions) I can remove to free some heap?

And, is this heap usage reasonable? I only have one diagram (a Sequence dia=
gram), with four Classifiers, and 22 Actions.

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