title: gwt modify meta property to facebook share
body: <p>Are there any solution to change html's meta property at run time in gwt?</p>
  
  <p>I try to change meta properties:</p>
  
  <pre><code>JQuery.select("meta[property='og\\:url']").attr("content", builder.buildString());
  JQuery.select("meta[property='og\\:title']").attr("content", Window.getTitle());
  JQuery.select("meta[property='og\\:video']").attr("content", videoURL);
  JQuery.select("meta[property='og\\:image']").attr("content", pictureURL);
  </code></pre>
  
  <p>and when I check:</p>
  
  <pre><code> Window.alert(" url: " +JQuery.select(("meta[property='og\\:url']")).attr("content") + " title: "+ JQuery.select(("meta[property='og\\:title']")).attr("content") + " video: " + JQuery.select(("meta[property='og\\:video']")).attr("content") + " image: "             + JQuery.select(("meta[property='og\\:image']")).attr("content")  );
  </code></pre>
  
  <p>the popup shows the correct new meta properies, but when I try to share, facebook use the old meta values. </p>