title: Does WPF/Xaml have something like Flex/MXML's ViewStack
body: <p>ViewStack in Flex/MXML is a container/panel control that holds multiple children but only makes one visible at a time, useful for implementing your own tab-style controls.  Does WPF/Xaml have a class that works the same as this?  I know it has its own dedicated tab control (what I'm trying to do isn't really a tab control, so not useful) and StackPanel, which isn't the same.  </p>