Context menus simply don't open:

<?xml version="1.0" encoding="UTF-8"?>
<!--
Do not edit this file it is generated by e(fx)clipse from ../src/application/TestMe.fxgraph
-->

<?import java.lang.*?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ContextMenu?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.layout.HBox?>

<HBox xmlns:fx="http://javafx.com/fxml">

<children>
<Button text="Hello World">
<contextMenu>
<ContextMenu>
<items>
<MenuItem text="Hello World"/>
</items>
</ContextMenu>
</contextMenu>
</Button>
</children>
</HBox>