title: create link in table cell and open float popup by click from it
body: <p>I have a CellTable and need a column with hyper links and onclick handlers inside cells.
  1st question, what am doing wrong if I have:</p>
  
  <pre><code>Column&lt;MyObject, Anchor&gt; linkColumn = new Column&lt;MyObject, Anchor&gt;(
      new AnchorCell()) {
      @Override
      public Anchor getValue(final obj) {
      Anchor link = new Anchor("link");
      link.addClickHandler(new ClickHandler() {
          @Override
          public void onClick(ClickEvent event) {
          Window.alert("clicked ");
          }
      });
      return link;
      }
  };
  cellTable.addColumn(linkColumn, "link column");
  </code></pre>
  
  <p>...</p>
  
  <pre><code>public class AnchorCell extends AbstractCell&lt;Anchor&gt; {
  @Override
  public void render(Context context, Anchor h, SafeHtmlBuilder sb) {
      sb.append(SafeHtmlUtils.fromTrustedString(h.toString()));
  }
  }
  </code></pre>
  
  <p>-but clicking to link - happens nothing</p>
  
  <p>and 2nd question: what's better way to open float (based on div or so, not separated browser window) pupup with text contents from that ClickHandler?</p>