I want to use Visbility in other project to do some operate,
but I purely write "Visibility, Visual Stuido can't find the reference,
so is add "System.Windows" and write "System.Windows.Visbility"
and add "System.Windows" and write "System.Windows.UIElement.Visbility" all not work,
Finally I add reference "PresentationCore" and write "Visibility" works
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