Reflect whole objects

Hi.

I need to recreate this as a script:

- Select all

- Object > Transform > Reflect

I have tried this:

if( app.documents.length >0){

    // here's the "flip horizontal" magic:

    var totalMatrix = app.getScaleMatrix(-100,100);

    // apply the transformation to all art in the document

    var doc = app.activeDocument;

    for( i =0; i < doc.pageItems.length; i++){

        doc.pageItems[i].transform( totalMatrix );

    }

}

But it reflects every object in its position, not the whole selection.

So i tried to add all objects to a group, and aply transformation to a group:

var totalMatrix = app.getScaleMatrix(-100,100);

newGroup = app.activeDocument.groupItems.add();

for ( a = 0; a < app.activeDocument.pageItems.length; a++ )

{

          app.activeDocument.pageItems[a].moveToBeginning(newGroup);

}

newGroup.transform(totalMatrix);

Now all objects are reflecteds as a group, but for some reason, compound paths are lost. All paths appear as a normal paths. (I loose the holes inside pahts)

¿How can I solve this?

I am using old CS3. ThankYou.