SceneBuilder 2.0 import custom components from Jar

[Christian]

Hi,
I was trying to import controlsfx-5.0.6 and controlsfx-5.0.6_20 into 
scenebuilder.
However only some or few controls could be imported.
When using these controls strange effects happen.
I was looking into the user guide in order to determine the requirements 
that have to be met by the components in the jar file.
However there was just a simple guideline about how to import and not 
how to develop custom components so that they match the scenebuilder.
I further turned the logging level of the scenbuilder to finest and 
hoped to see at least some stacktraces that might give me a hint.
But I only saw stacktraces when using the imported components (mainly 
belonging to missing resources because of classpath problems) nothing 
from the import/jarfile-scan itself.
I was hoping that I can adjust the controlsfx classes so that they work 
fine with the scenebuilder.
Any hints are more then welcome!

ps.:
It seems that scenebuilder is closed source, or is the some source out 
there I could start with?
Is there an early access release for 8u20?

Thanks,
Christian