@amb26 I am using the renderOnPreference option to indicate which preference to base the creation and destruction of the sub panel on. I would have preferred to have put this up one level so that it was the configuration to the composite panel for when to create it. However, it seems that the set of options it takes at that level are restricted. I found that I could add it in by specifying an argumentMap. I would have liked to put this in fluid.prefs.subPanel grade. However, this grade is added to the sub panels dynamically; which seems to be too late. I'm open to other suggestions.