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While working with the Calendar control in UI for Windows 8.1 XAML Q3 2013, I am loading asynchronously an rss feed of events and setting special dates as I process the feed. When the control is loaded on the page with the build platform target set to AnyCPU, the control requires a mouse over to present the decorations of the special dates. Changing the platform target to either ARM or x64 causes the expected behavior.