I create a path on the AnchorPane, clear all path.and add a ArcTo into the path,but the ArcTo is not visible.

Or,create a Path on the AnchorPane(pressed "Path" in Library and drag it into the AnchorPane used by mouse),I found the node(Path) has five children-node,MoveTo,LineTo,ArcTo,QuadCurveTo,and ClosePath.delete all children-node except ArcTo,Now,the AnchorPane is nothing left.How can I design a Path visually?

Product Version
JavaFX Scene Builder 2.0

Build Information
Version: 2.0-b20, Changeset: 5cac093e5c1f
Date: 2014-03-21 09:29