UnityEditor.PopupWindowWithoutFocus.IsVisible C# (CSharp) Method

        public static bool IsVisible()
        {
            return (s_PopupWindowWithoutFocus != null);
        }

 public void OnWindowResized()
 {
     if (PopupWindowWithoutFocus.IsVisible())
     {
         PopupWindowWithoutFocus.Hide();
     }
 }