Fixes navigation controller sometimes trying to perform an apply when there's already one in progress.
Similar fix to the last commit, fixes the navigation controller when working in the UI project and the create action is displayed by default instead of the menu, the menuDialog was not being cleared when changing nodes. This causes a stack overflow exception and also causes the html stack to build up. However, now there's a flicker because the html is being replaced, not sure the best way to fix this ?