JavaFX 2.0 :: HTMLEditor - Default Size / Cannot Fill Full Screen

The code:
 
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.BorderPane;

[Code] ....
 
run (when window height > 700px ) :
 
HTMLEditor  default height is 670px, the other area (green color) is not filled,why?
 
HTMLEditor   高度总是670px, 怎么把HTMLEditor 填充满窗口?
 
这是一个bug吗？

is it bug？