There is no parent-child relationship between windows in WPF. (And even in Forms, such relationship inherited from Control is not really functional.)
To make a feel of paging you can use just one main window (best option for most applications, by the way) and different layout designs. For example, you can use
StackPanel hosting a set of other panels. What you though as of a "child" windows will be one of those children panels. In this case control of pages could be done using a regular scroll bar.
Alternatively, you can dynamically load some panels with children controls from data and flip-page those panel using some control implementing Left-Right commands (or Up-Down if you prefer).
The design described above could be modified if the number of such panels a not so big. You can pre-create them all and control their visibility: hide all but one and this way shuffle the only visible child panel.
These are just the simplest ideas. I saw a number of advanced design with animation, etc. For example, people implemented a number of flip-page book designs.
See:
http://wpfbookcontrol.codeplex.com/[
^],
http://blogs.msdn.com/b/mitsu/archive/2006/11/05/flip-page-demo-using-wpf.aspx[
^],
Creating a 3D book-shaped application with speech and ink using WPF 3.5[
^],
http://windowsclient.net/downloads/folders/wpfsamples/entry5100.aspx[
^].
You will be able to find more if you Google.
—SA
Submit an article or tip