❔ Dynamically adding xaml code from 1 page to another pages xaml code

I'm working on a simple barbershop application that let's people make appointments etc. At the moment i have a home page, from where you can press a button that opens a login page, after successfully logging in, i want to dynamically add xaml code into the home.xaml from the login.xaml.cs, but i can't access the elements of home.xaml.