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Saw this in 1.3.4. Might be fixed in 1.3.5, but just wanted to point it out just in case:
private void UntrackTarget(Page page)
if (page != null)
((ObservableCollection<ToolbarItem>) page.ToolbarItems).CollectionChanged += this.OnCollectionChanged;
I believe this should be a "-=" rather than "+=". Looks like a copy/paste issue. :) I apologize if I have this wrong. It's something I noticed while checking out your internals and thought I would point it out.
This should be fixed in 1.4.1-pre1