I am having an issue binding header in a HeaderTemplate. When I do the following in xaml, this textblock either doesn’t appear or there is no text shown in it making it invisible:

Using WinUi 3 I am trying to allow a user to add data to an SQLite database by the way of controls on a page. In this particular case I have 2 text boxes whose text value I send to a RelayCommand when a button is clicked.