KML Balloon will not automatically open - kml

Question

From what I've read to have a placemark balloon automatically open (without the need to click on it) you simply put <open>1</open> under the <placemark> tag.
I've also seen the <open> tag placed other places such as under the <document> tag but no matter where I place it the balloon never opens up by itself.
Here's the file I'm using (I placed the <open> tag in three different places hoping it would work):
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:location="http://blah.com">
<Document>
<name>RSSToKml</name>
<open>1</open>
<StyleMap id="m_ylw-pushpin">
<Pair>
<key>normal</key>
<styleUrl>#s_ylw-pushpin</styleUrl>
</Pair>
<Pair>
<key>highlight</key>
<styleUrl>#s_ylw-pushpin_hl0</styleUrl>
</Pair>
</StyleMap>
<Style id="s_ylw-pushpin">
<IconStyle>
<scale>1.1</scale>
<Icon>
<href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
</Style>
<Style id="s_ylw-pushpin_hl0">
<IconStyle>
<scale>1.3</scale>
<Icon>
<href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
</Style>
<Placemark>
<name>A name</name>
<open>1</open>
<description>A description</description>
<LookAt>
<longitude>-73.99736287597681</longitude>
<latitude>40.71745136763278</latitude>
<altitude>0</altitude>
<heading>-46.51707308500568</heading>
<tilt>5.83698745180558</tilt>
<range>7808.551256710743</range>
<gx:altitudeMode>relativeToSeaFloor</gx:altitudeMode>
</LookAt>
<styleUrl>#m_ylw-pushpin</styleUrl>
<Point>
<gx:drawOrder>1</gx:drawOrder>
<coordinates>-73.9994479424963,40.71617147826365,0</coordinates>
</Point>
</Placemark>
</Document>
</kml>

Answer 1

here's the tame plate of automatically balloon visibility, i hope it'll:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2"
xmlns:gx="http://www.google.com/kml/ext/2.2">
<Placemark>
<name>automatically balloon </name>
<description>
Located in Paris, France.
This description balloon opens
when the Placemark is loaded.
</description>
<gx:balloonVisibility>1</gx:balloonVisibility>
<Point>
<coordinates>57.0833,30.2833,0</coordinates>
</Point>
</Placemark>
</kml>