Popup popUpControl = new Popup();
popUpControl.PlacementTarget = this;
popUpControl.StaysOpen = true;
popUpControl.Child = new MyUserControl(); /// my user control
popUpControl.Opacity = 0.5; // this code has no effect in the appearance of the popup
popUpControl.IsOpen = true;
Popup popUpControl = new Popup();
popUpControl
阅读背景：
不透明度未应用于WPF弹出控件
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