WPF：對話框在*主窗口下顯示*。如何讓它上升到頂峯？

Question

我使用此代碼生成打印預覽窗口。

using (XpsDocument doc = new XpsDocument(fileName, FileAccess.Read)) 
{ 
    FixedDocumentSequence fds = doc.GetFixedDocumentSequence(); 

    using (var reader = new System.Xml.XmlTextReader(new StringReader(xaml))) 
    { 
     Window preview = System.Windows.Markup.XamlReader.Load(reader) as Window; 

     DocumentViewer dv1 = LogicalTreeHelper.FindLogicalNode(preview, "dv1") as DocumentViewer; 
     dv1.Document = fds as IDocumentPaginatorSource; 
     dv1.FitToMaxPagesAcross(1); 

     // show the dialog 
     preview.ShowDialog(); 
    } 
} 

但預覽窗口通常顯示在主窗口下方。我怎樣才能使預覽保持在最前？

該代碼在運行時從一個簡單的XAML模板動態生成一個窗口，但是該代碼的特定方面應該與我所遇到的問題無關。

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重複：
How do I focus a modal WPF Window when the main application window is clicked?

Answer 1

顯示對話框之前設置preview窗口當前窗口的Owner財產。

preview.Owner = // the current window 
preview.ShowDialog();