How to display from nested usercontrol another usercontrol class on button click event?

[LAPEC]

Hello everyone In my WPF project I have created a UserControl (this is called Applic.xaml), and within this usercontrol I have placed a nested UserControl (this is called PasswordScreen.xaml). Here is the xaml design code of Applic.xaml usercontrol:

              **"HERE IS THE UserControl THAT I PLACED..."**

In PasswordScreen.xaml usercontrol there is a button (called Login). On the