Illustrator :: Execution Of Menu Command Without User Interaction?

It's a shame that Illustrator's scripting ability isn't as robust as InDesign's.
 
I have a script that goes through every path in a file and records all of the colors used in it.  The problem is that it stumbles when faced with certain types of "PluginItem"s.  I've been able to fix some of it, such as when it comes across a "Compound Shape" (as opposed to a Compound Path or other normal Illustrator object).  In such an instance I can select the path, then call a menu command to expand that selection:
 
if (currentItem.typename == "PluginItem")
{
    currentItem.selected = true;
    app.executeMenuCommand("expandStyle");
    currentItem = app.selection[0];
    app.executeMenuCommand("deselectall");
    colorsInUse(currentItem);
}
 
I had to do some scrounging to figure out how to execute that "Expand Appearance" command that is in the "Object" menu in Illustrator.  In fact, the only resource I discovered was a list that is partially in Japanese.  By the way, that last item in the list is a recursive call to the same function in which this if statement resides.
 
So, the above code works for "PluginItems" that can be rectified with a call to the "Object -> Expand Appearance" menu item.  What about those that don't, such as an enveloped object?  With those, I'd normally just run the command above "Expand Appearance", called simply "Expand…"  Well, that menu items pops up a dialog which, when the user clicks "OK" on it, will properly expand the enveloped object so that the script can continue reading the paths that made it up and get fill & stroke colors.
 
I can call this menu item with a simple "app.executeMenuCommand("Expand3");", but my problem is that dialog which appears.  I don't want the user to have to click "OK" on it every time it pops up when the script wants to expand that object, but the traditional "app.userInteractionLevel = UserInteractionLevel.DONTDISPLAYALERTS;" method doesn't work.
 
Is there any way to expand enveloped items without having a dialog pop up on the user?