title: How to show grid lines for rows in TreeTableView
body: <p>I have the following FXML:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  
  &lt;?import java.lang.*?&gt;
  &lt;?import javafx.scene.control.*?&gt;
  &lt;?import javafx.scene.layout.*?&gt;
  
  &lt;AnchorPane id="AnchorPane" prefHeight="600.0" prefWidth="1000.0" stylesheets="@../css/fxmlDemo.css" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="fxmldemo.controller.MainController"&gt;
      &lt;children&gt;
          &lt;TreeTableView fx:id="treeTableView" prefHeight="600.0" prefWidth="1000.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" xmlns:fx="http://javafx.com/fxml"&gt;
              &lt;columns&gt;
                  &lt;TreeTableColumn fx:id="nameColumn" prefWidth="600.0" text="Name" /&gt;
                  &lt;TreeTableColumn fx:id="sizeColumn" prefWidth="100.0" text="Size" /&gt;
                  &lt;TreeTableColumn fx:id="lastModifiedColumn" prefWidth="300.0" text="Modified" /&gt;
              &lt;/columns&gt;
          &lt;/TreeTableView&gt;
      &lt;/children&gt;
  &lt;/AnchorPane&gt;
  </code></pre>
  
  <p>And in my fxmlDemo.css file I have tried things like:</p>
  
  <pre><code>* { 
    -fx-border-style: solid;
  }
  </code></pre>
  
  <p>And </p>
  
  <pre><code>tree-table-view { 
    -fx-border-style: solid;
  }
  </code></pre>
  
  <p>And</p>
  
  <pre><code>tree-item { 
    -fx-border-style: solid;
  }
  </code></pre>
  
  <p>The first one puts a border around everything in the FXML, the other two do nothing.</p>
  
  <p>What I want is to show grid lines like an Excel spread sheet.  The code I'm using is very similar to what is seen in <a href="https://wikis.oracle.com/display/OpenJDK/TreeTableView+API+Examples#" rel="nofollow">this</a> example, but mine has been modified to actually work :)</p>
  
  <p><a href="http://docs.oracle.com/javafx/2/api/javafx/scene/doc-files/cssref.html" rel="nofollow">Here</a> is a link to the Java FX CSS Reference Guide, but it does not contain information on TreeTableView or its sub-components.</p>