Ответ 1
Поместите ScrollViewer внутри вашего окна:
<Window x:Class="WpfApplication2.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<ScrollViewer >
<!-- Window content here -->
</ScrollViewer>
</Window>