SceneBuilder does not add .fxml extension to file name on save

Product Version
JavaFX Scene Builder 2.0 (Developer Preview)

Build Information
Version: 2.0-b06, Changeset: d13f627a2315
Date: 2013-11-07 07:38

JavaFX
Toolkit = QuantumToolkit
Pipeline = SWPipeline
Hardware acceleration DISABLED

Java
1.8.0-ea-b113, Oracle Corporation

Operating System
Linux, amd64, 2.6.35.14-96.PhenomX4full.fc14.x86_64