Product Version: NetBeans IDE 6.0 Beta 1 (Build 200709141330) 
Java: 1.7.0-ea; Java HotSpot(TM) Client VM 1.7.0-ea-b15 
System: Windows XP version 5.1 running on x86; Cp1252; en_US (nb)

Steps to reproduce:
1.Install JavaFX from NetBeans Update Center for 6.0Beat1 through Plugin Manager (Tools|Plugins)
2.Create JavaFX project
3.Edit the Main.fx to contain following
package javafxapplication1;
import javafx.ui.*;
     Frame {
            title: "Hello World JavaFX"
            width: 200
            height: 50
            content: Label {
                text: "Hello World"
            }
            visible: true
     }
4.Run project by F6 - the Hello sample window appears and the console contains the following snippet:
---------------------------------%<----------------------------------------------------------
To run this application from the command line without Ant, try:
java -jar "C:\My Documents\NetBeansProjects\JavaFXApplication1\dist\JavaFXApplication1.jar"
---------------------------------%<----------------------------------------------------------
5.Execute recommended command in console outside IDE
-> It ends without success and following exception appears:
java -jar "C:\My Documents\NetBeansProjects\JavaFXApplication1\dist\JavaFXApplication1.jar"
Exception in thread "main" java.lang.NoClassDefFoundError: javafxapplication1/Main
Caused by: java.lang.ClassNotFoundException: javafxapplication1.Main
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)