Please see the attached test case , which adds 5 titledpanes to accordion and after 5th it removes top item and adds it back to last.

Run the project .
1) Click on the Add button 5 times
2) Click on "somenum 2" TitledPane and then click on Add button
3) Click on "somenum 3" TitledPane and then click on Add button
4) Click on "somenum 3" TitledPane and then click on Add button
4) Click on "somenum 0" TitledPane

and we get Stack OverFlowException, also the TitledPane is not longer accessible through mouse



java.lang.RuntimeException: java.lang.StackOverflowError
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:235)
at com.sun.glass.ui.View.handleMouseEvent(View.java:491)
at com.sun.glass.ui.View.notifyMouse(View.java:869)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$2$1.run(WinApplication.java:62)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.StackOverflowError
at javafx.animation.Timeline$2.compare(Timeline.java:163)
at javafx.animation.Timeline$2.compare(Timeline.java:160)
at java.util.TimSort.countRunAndMakeAscending(TimSort.java:324)
at java.util.TimSort.sort(TimSort.java:189)
at java.util.TimSort.sort(TimSort.java:173)
at java.util.Arrays.sort(Arrays.java:659)
at javafx.animation.Timeline.updateKeyFrames(Timeline.java:170)
at javafx.animation.Timeline.access$000(Timeline.java:69)
at javafx.animation.Timeline$1.onChanged(Timeline.java:96)
at com.sun.javafx.collections.TrackableObservableList.callObservers(TrackableObservableList.java:50)
at com.sun.javafx.collections.ObservableListWrapper.setAll(ObservableListWrapper.java:220)
at com.sun.javafx.collections.ObservableListWrapper.setAll(ObservableListWrapper.java:231)
at com.sun.javafx.scene.control.skin.TitledPaneSkin.doAnimationTransition(TitledPaneSkin.java:328)
at com.sun.javafx.scene.control.skin.TitledPaneSkin.setExpanded(TitledPaneSkin.java:159)
at com.sun.javafx.scene.control.skin.TitledPaneSkin.handleControlPropertyChanged(TitledPaneSkin.java:134)
at com.sun.javafx.scene.control.skin.SkinBase$3.changed(SkinBase.java:272)
at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:107)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:367)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:100)
at javafx.beans.property.BooleanPropertyBase.fireValueChangedEvent(BooleanPropertyBase.java:123)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:130)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:163)
at javafx.scene.control.TitledPane.setExpanded(TitledPane.java:155)