prs/prs.desktop/Grids/ActivityEmployeeGrid.cs

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

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