Use Frame to Load another Xaml file
<Window x:Class="SimpleStyles.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="SimpleStyles"
Background="#F8F8F8">
<ScrollViewer>
<WrapPanel>
<HeaderedItemsControl Header="Frame">
<StackPanel>
<Frame Source="page1.xaml" Width="200" Height="200"/>
</StackPanel>
</HeaderedItemsControl>
</WrapPanel>
</ScrollViewer>
</Window>
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