prs/prs.desktop/Panels/Employees/EmployeeActivityGrid.cs

using System;
using System.Linq.Expressions;
using Comal.Classes;
using InABox.DynamicGrid;

namespace PRSDesktop
{
    public class EmployeeActivityGrid : DynamicCrossJoinGrid<EmployeeActivity, Employee>
    {
        public override Expression<Func<EmployeeActivity, Guid>> LeftMapping => x => x.Employee.ID;
        public override Expression<Func<Employee, Guid>> LeftProperty => x => x.ID;
    }
}