using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using MercatorApi;
using MercatorUi;
using System.Reflection;

namespace Main
{
    public class Customizer : MercatorUi.ICustomizers.IExec
    {

        public void Main(MercatorUi.ICustomizers.ExecAction Action)
        {
            if (Action == MercatorUi.ICustomizers.ExecAction.DossierOpen)
            {
                ...
            }
        }

    }
}