Some Tips About VS2015
Xaml edit bug about vs2013+
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sometimes, vs will say some class not found in the namespace. but, we confirm the class is defined in that namespace. it is a vs bug. just try to re-start vs multi times, it can workaround.
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Sometimes, we configure the Style for TextBlock, TextBox, then the Style seems invalid while developing our code. just re-start the vs will fix this.