How to invoke another .ux within my app?

How-to Discussions
1

Do you know how can I “invoke” another .ux within my app?

For example, using MainView.ux , clicking a button and invoking SecondView.ux

2 
<Button>
  <Clicked>
    <Set Target="showSecondView.Value" Value="true" />
  </Clicked>
</Button>
<WhileTrue ux:Name="showSecondView" Value="false">
  <ux:Include File="SecondView.ux" />
</WhileTrue>