tions) and an arrow pointing at the owner.
 Due to the nature of popup windows the Popover will move around with the parent
 window when the user drags it.

 <p>The Popover can be detached from the owning node by dragging it away from the
 owner. It stops displaying an arrow and starts displaying a title and a close
 icon.

 <p>Example

 <pre><code>
 var textFlow = new TextFlow(new Text("Some content"));
 textFlow.setPrefWidth(300);

 var popover = new Popover(textFlow);
 popover.setTitle("Title");

 var ow