how to make Contentview reusable?

According to the documentation Contentview is like UserControl of WPF. But we arent able to make it reusable, are we? I tried to use it as below but It doesnt work.

this

 <ContentView>
    <local:myControlView ></local:myControlView>
  </ContentView>

or this like wpf

<local:myControlView></local:myControlView>

thanks.