Opening following FXML with SB from IDE(e(fx)clipse) fails.

[Stack]
java.io.IOException: javafx.fxml.LoadException:
/C:/eclipse44/workspace/MyControlTest/src/foo/MyControlTest.fxml:13

at com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.load(FXOMLoader.java:92)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMDocument.<init>(FXOMDocument.java:80)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMDocument.<init>(FXOMDocument.java:95)
at com.oracle.javafx.scenebuilder.kit.editor.EditorController.updateFxomDocument(EditorController.java:2370)
at com.oracle.javafx.scenebuilder.kit.editor.EditorController.setFxmlTextAndLocation(EditorController.java:655)
at com.oracle.javafx.scenebuilder.app.DocumentWindowController.loadFromFile(DocumentWindowController.java:386)
at com.oracle.javafx.scenebuilder.app.SceneBuilderApp.performOpenFiles(SceneBuilderApp.java:579)
at com.oracle.javafx.scenebuilder.app.SceneBuilderApp.handleOpenFilesAction(SceneBuilderApp.java:447)
at com.oracle.javafx.scenebuilder.app.SceneBuilderApp.handleLaunch(SceneBuilderApp.java:427)
at com.oracle.javafx.scenebuilder.app.AppPlatform.requestStartGeneric(AppPlatform.java:139)
at com.oracle.javafx.scenebuilder.app.AppPlatform.requestStart(AppPlatform.java:106)
at com.oracle.javafx.scenebuilder.app.SceneBuilderApp.start(SceneBuilderApp.java:371)
at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
at java.lang.Thread.run(Thread.java:744)
Caused by: javafx.fxml.LoadException:
/C:/eclipse44/workspace/MyControlTest/src/foo/MyControlTest.fxml:13

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2595)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2425)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.load(FXOMLoader.java:89)
... 22 more
Caused by: com.sun.javafx.fxml.PropertyNotFoundException: Static property "margin" does not exist or is read-only.
at com.sun.javafx.fxml.BeanAdapter.put(BeanAdapter.java:595)
at javafx.fxml.FXMLLoader$PropertyElement.set(FXMLLoader.java:1414)
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:784)
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2839)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532)
... 24 more

[FXML]
<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.*?>
<?import foo.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.VBox?>

<VBox xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
   <children>
      <MyControl prefHeight="100.0" prefWidth="200.0" style="-fx-background-color: #ff0;">
         <VBox.margin>
            <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
         </VBox.margin></MyControl>
   </children>
</VBox>

[How to reproduce]
1) Create new FXML with SB
2) add VBox as root component and add custom control to VBox
3) define Margin
4) save FXML and exit SB
5) reopen FXML with SB from e(xf)clipse

[Other informations]
When invoke SB from command console with the FXML path, it failed.(stack is the same as shown above).
When open the FXML from open menu on SB, it succeeded.
When load the FXML by FXMLLoader, it succeeded and the scene shown normally.
After removing VBox.margin tag by text editor, SB opened it normally again.