WPF frame control is capable of displaying both WPF and HTML content. Also it allows navigation between different contents.
Example:
XAML:
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
xmlns:src="clr-namespace:WpfApplication2" Width="362.5"
>
<StackPanel>
<Frame Source="Page1.xaml">
</Frame>
<Frame Source="Page1.xaml">
<Frame.LayoutTransform>
<RotateTransform Angle="90" />
</Frame.LayoutTransform>
</Frame>
</StackPanel>
</Window>