Get text from second window back to main window

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C#

XAML

WPF

OK what I am trying to do is as follows. My main window has a button(btnAdmin) that opens up a new window(Admin.xaml). From the Admin window the user enters a password then clicks ok. When password is entered correctly it will close that window and go back to main window and unlock 4 buttons that were previously locked.

What I'm trying to do is in the second window if password is right it will save a bool variable as true and when you go back to main window that bool variable will be passed to a method that will unlock 4 buttons.

Not sure if this is the right method or I should be doing something else.

What I have so far

Main.xaml.cs btnAdmin Click

 private void btnAdminMode_Click(object sender, RoutedEventArgs 
            Admin admin = new Admin();
            admin.Show();
}

Admin.xaml.cs Window OK button click

private void btnOK_Click(object sender, RoutedEventArgs e)
       {
           if (ptxtPassword.Password == "tqty")
           {
               string msgtext = "Correct!\nAdministrator Rights are now ON";
               string txt = "Password";
               MessageBoxButton button = MessageBoxButton.OK;
               MessageBox.Show(msgtext, txt, button);
               this.Close();
           }
           else
           {
               string msgtext = "Incorrect Password";
               string txt = "Password";
               MessageBoxButton button = MessageBoxButton.OK;
               MessageBox.Show(msgtext, txt, button);
           }
       }