в MS.Internal.WeakEventTable.Purge(Boolean purgeAll)
в MS.Internal.WeakEventTable.CleanupOperation(Object arg)
в System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
в System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
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Делаю простые вещи.