#1069: Pages are now destroyed when removed from LibraryWindow, and each Page...
#1069: Pages are now destroyed when removed from LibraryWindow, and each Page destroys all the widgets it creates that are not contained/parented when the Page is destroyed (i.e. the menu bar). This issue was exacerbated by drag-and-drop, which obtains references on all widgets in the application and releases them after the Page was deref'ed.
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