After upgrading my SDK to B37 in getting a recurrent NullPointer and also my TitledPane are "half-painted. I include two images one with B37 and the other with B36 (the frame is still designed in rough). Although the buttons are not painted if you click in the area they are working

The error is:

java.lang.NullPointerException
at com.sun.javafx.tk.quantum.EmbeddedScene$PaintRunnable.paintImpl(EmbeddedScene.java:154)
at com.sun.javafx.tk.quantum.EmbeddedScene$PaintRunnable.run(EmbeddedScene.java:230)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
at com.sun.prism.render.RenderJob.run(RenderJob.java:29)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at com.sun.javafx.tk.quantum.QuantumRenderer$ObservedRunnable.run(QuantumRenderer.java:70)
at java.lang.Thread.run(Thread.java:662)