Cootz_PasswordManager/PasswordManager/Resources/Styles/Converters.xaml.cs
using PasswordManager.Model.Converter;

namespace PasswordManager.Resources.Styles;

public partial class Converters : ResourceDictionary
{
    public Converters()
    {
        InitializeComponent();

        //If initialized in xaml throws an exception
        Add("FirstValidationConverter", new FirstValidationConverter());
    }
}