click link without ID or Class with casperJS - phantomjs

Question

I'm trying to get the list of links on the menu on the left on this page: http://www.hpenterprisesecurity.com/vulncat
the first thing I'm trying to do is click the "Expand All" link (on the top left corner) so the list gets expanded.
I have tried multiple ways to use the Xpath in different ways with no success on this page, this was my last try:
casper.start('http://www.hpenterprisesecurity.com/vulncat', function() {
casper.wait(5000);
this.echo("---------- TITLE: ");
this.echo(this.getTitle());
});
casper.thenClick(x('//*[#id="theContentCenter"]/div/p/a[1]/strong[contains(text(),"Expand")]'),function(){
casper.wait(5000,function(){
casper.capture("expanded.png");
});
});
Maybe since the page lacks Ids and Tags for most elements my approach won't work?
Thanks
the set-up:
casper = require('casper').create({
verbose:true,
logLevel:"debug"
});
casper.userAgent('Mozilla/5.0 (iPad; U; CPU OS 3_2_1 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Mobile/7B405');
casper.viewport = {width: 1280, height: 720};
var x = require('casper').selectXPath;
phantomjs: 1.9.8
casperjs: 1.1.0-beta3
RESOURCE ERROR:
[info] [phantom] Starting...
[info] [phantom] Running suite: 2 steps
[info] [phantom] Starting...
[info] [phantom] Running suite: 4 steps
[debug] [phantom] opening url: http://www.hpenterprisesecurity.com/vulncat, HTTP GET
[debug] [phantom] Navigation requested: url=http://www.hpenterprisesecurity.com/vulncat, type=Other, willNavigate=true, isMainFrame=true
[debug] [phantom] Navigation requested: url=http://www.hpenterprisesecurity.com/vulncat/en/vulncat/index.html, type=Other, willNavigate=true, isMainFrame=true
[debug] [phantom] url changed to "http://www.hpenterprisesecurity.com/vulncat/en/vulncat/index.html"
[debug] [phantom] Navigation requested: url=http://www.hpenterprisesecurity.com/vulncat/en/vulncat/header.html, type=Other, willNavigate=true, isMainFrame=false
[debug] [phantom] Navigation requested: url=http://www.hpenterprisesecurity.com/vulncat/en/vulncat/all.html, type=Other, willNavigate=true, isMainFrame=false
[debug] [phantom] Navigation requested: url=http://www.hpenterprisesecurity.com/vulncat/en/vulncat/intro.html, type=Other, willNavigate=true, isMainFrame=false
ResourceError: {
"errorCode": 203,
"errorString": "Error downloading http://www.hpenterprisesecurity.com/vulncat/en/vulncat/css/frame.css - server replied: Not Found",
"id": 7,
"url": "http://www.hpenterprisesecurity.com/vulncat/en/vulncat/css/frame.css"
}
ResourceError: {
"errorCode": 2,
"errorString": "Connection closed",
"id": 9,
"url": "http://www.fortifysoftware.com/images/gui/maincontent.level3.h1.bg.png"
}
[debug] [phantom] Successfully injected Casper client-side utilities
[info] [phantom] Step anonymous 2/4 http://www.hpenterprisesecurity.com/vulncat/en/vulncat/index.html (HTTP 200)
---------- TITLE:
A Taxonomy of Coding Errors that Affect Security
[info] [phantom] Step anonymous 2/4: done in 770ms.
[info] [phantom] Step _step 3/5 http://www.hpenterprisesecurity.com/vulncat/en/vulncat/index.html (HTTP 200)
[info] [phantom] Step _step 3/5: done in 770ms.
[info] [phantom] wait() finished waiting for 5000ms.
[info] [phantom] Step _step 4/5 http://www.hpenterprisesecurity.com/vulncat/en/vulncat/index.html (HTTP 200)
[debug] [phantom] Mouse event 'mousedown' on selector: xpath selector: //*[#id="theContentCenter"]/div/p/a[1]/strong[contains(text(),"Expand")]
CasperError: Cannot dispatch mousedown event on nonexistent selector: xpath selector: //*[#id="theContentCenter"]/div/p/a[1]/strong[contains(text(),"Expand")]
/usr/lib/node_modules/casperjs/modules/casper.js:1355 in mouseEvent
/usr/lib/node_modules/casperjs/modules/casper.js:462 in click
/usr/lib/node_modules/casperjs/modules/casper.js:1793 in _step
/usr/lib/node_modules/casperjs/modules/casper.js:1553 in runStep
/usr/lib/node_modules/casperjs/modules/casper.js:399 in checkStep
Unsafe JavaScript attempt to access frame with URL about:blank from frame with URL file:///usr/lib/node_modules/casperjs/bin/bootstrap.js. Domains, protocols and ports must match.
Unsafe JavaScript attempt to access frame with URL about:blank from frame with URL file:///usr/lib/node_modules/casperjs/bin/bootstrap.js. Domains, protocols and ports must match.
Unsafe JavaScript attempt to access frame with URL about:blank from frame with URL file:///usr/lib/node_modules/casperjs/bin/bootstrap.js. Domains, protocols and ports must match.