Is there a way to change the tab indent / formatting of the XML when exporting to a string?

I have an XML object that I'm exporting to a string like so:

var xml:XML = new XML(myString);
trace(xml.toXMLString());

This results in something like:

<root>
 <item>
  <item>
   <item/>
  </item>
 </item>
</root>

However, the indentations are much to short in my opinion especially with a lot of content and it's hard to read. Irregardless of the reasons is there a way to increase the indentations like maybe to use tabs or more tabs instead of spaces? Not sure what it's using (will check). I would like it to look closer to this. It looks much cooler too.

<root>
    <item>
        <item>
            <item/>
        </item>
    </item>
</root>