WPF MVVM UserControl绑定以创建向导UI

I m working in a WPF MVVM Project and I am using one Wpf Window. In this window i have a space for one usercontrol and two buttons next and back. When i click the next button I want usercontrol1 to be replaced with usercontrol2. etc.I m working in a WPF MVVM Project and I am usin