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After the removal of FX-enabled platforms (see Issue #229678) there is no mechanism of auto-registering such platform. Auto-registration had been done in NetBeans-JDK bundles so far in order to save users the effort necessary to set-up the default FX platform. This should now be disabled/removed, as any Java Platform since 7u6+ is now directly usable in FX Projects without explicit FX-enabling hassle.
Relatedcleanup inside JavaFX 2 Platform and JavaFX 2 Project modules: http://hg.netbeans.org/jet-main/rev/f68630ccd728