<dyn:DynamicPageShim xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:dyn="clr-namespace:DynamicNavigation;assembly=DynamicNavigation" 
    xmlns:my="clr-namespace:Page1;assembly=Page1">
    <my:Page1Host />
</dyn:DynamicPageShim>