Child wpf window above parent window

I have WPF application with main window. I want to create child WPF window which always must be above ONLY parent window. If I set TopMost property for new window then window开发者_开发知识库 is above ALL nonTopMost windows on desktop. It's not what I want.

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Set the Owner property of the child window so that it refers to the parent window.

child.Owner = parent;

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Depending on the nature of the window, I often use a "Fake" window that is really just a layer in the parent along with a partailly transparent grey layer between that makes the parent look ghosted while the child is active. You can then keep the child window set to collapsed until it is needed.