提示未声明名称“Brushes”，为什么
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悬赏园豆：20
[已关闭问题]
代码如下：
Private Sub OnClick3(ByVal sender As Object, ByVal e As RoutedEventArgs)
btn1.Background = Brushes.Pink
btn2.Background = Brushes.LightBlue
End Sub
提示那两行 未声明名称“Brushes”。
