Problem enconding utf-8

I have a DB MSSQL SERVER 2008, i’m trying to show some columns, but with Firefox it popup an alert.
How can i create a XML with another encoding?


With grid connector set encoding


using custom XML like (I´m using PHP)

header("Content-type: text/xml");

echo('<?xml version="1.0" encoding="utf-8"?>'); 
echo "<rows>";

  echo"<row id='1'>";
    echo "<cell ><![CDATA[ cell 1-1 ]]></cell>";
    echo "<cell ><![CDATA[ cell 1-2 ]]></cell>";

  echo"<row id='2'>";
    echo "<cell ><![CDATA[ cell 2-1 ]]></cell>";
    echo "<cell ><![CDATA[ cell 2-2 ]]></cell>";

echo "</rows>";