So i manage to get it working...

my controller for now

 public class HomeController : Controller
    {
        //
        // GET: /Idonic/Home/

        public ActionResult Index()
        {
            GridModel grid = CreateGridModel();
            return View(grid);
        }
        // Take grid creation outside as it will be used in all methods:
        private GridModel CreateGridModel()
        {
            GridModel grid = new GridModel();

            // Set up properties and columns:
            grid.AutoGenerateColumns = false;
            grid.Columns = new List();
            grid.Columns.Add(new GridColumn("IDEmpresa", "IDEmpresa", "number", "10px"));
            grid.Columns.Add(new GridColumn("Company Name", "NomeEmpresa", "string", "150px"));
         

            grid.PrimaryKey = "IDEmpresa";
            grid.AutoGenerateLayouts = false;

            // Create child layout
            GridColumnLayoutModel layout = new GridColumnLayoutModel();
            layout.Key = "Utilizadores";

            layout.PrimaryKey = "UserId";
            layout.AutoGenerateColumns = false;

            layout.Columns = new List();
            layout.Columns.Add(new GridColumn("UserId", "UserId", "number", "100px"));
            //layout.Columns.Add(new GridColumn("Customer", "CustomerID", "string", "100px"));
            

            // Add paging to child layouts (different from the parent's)
            GridPaging layoutPaging = new GridPaging();
            layoutPaging.VisiblePageCount = 2;
            layoutPaging.PageSize = 5;
            layoutPaging.Type = OpType.Remote;
            layout.Features.Add(layoutPaging);

            //add that layout to the grid
            grid.ColumnLayouts.Add(layout);

            //most importantly turn Load On demand on and define response Urls:
            grid.LoadOnDemand = true;
            grid.DataSourceUrl = this.Url.Action("BindParent");
            grid.ColumnLayouts[0].DataSourceUrl = this.Url.Action("BindChild");

            //Add features:
            GridSorting sorting = new GridSorting();
            sorting.Type = OpType.Remote;
            grid.Features.Add(sorting);
            GridPaging paging = new GridPaging();
            paging.PageSize = 10;
            paging.Type = OpType.Remote;
            grid.Features.Add(paging);
            GridFiltering filtering = new GridFiltering();
            filtering.Type = OpType.Remote;
            grid.Features.Add(filtering);

            //And lastly set ID so the client widget can be normally interacted with (see the events in the view)
            grid.ID = "Grid_Utilizadores_By_Empresa";

            // Return the finished model
            return grid;
        }

        public JsonResult BindParent()
        {
            //create a model
            GridModel grid = CreateGridModel();
            //set its datasource
            MvcIdonic DB = new MvcIdonic();
            var dataSource = DB.Empresas;
            grid.DataSource = dataSource.Where(x => x.Rem == 0).OrderBy(x=>x.IDEmpresa); --->linq to entites, fetch all companyes.
            //and use the GetData() method to return the results
            return grid.GetData();
        }

        public JsonResult BindChild(string path, string layout)
        {
            
            string[] arrSplitVarPath = path.Split(':');  ->to find the id of the company...dont know if it is the correct way,.
            int IDEmpresa = Int32.Parse(arrSplitVarPath[1]);
            //create a model
            GridModel grid = CreateGridModel();
            //set its datasource
            MvcIdonic DB = new MvcIdonic();
            var dataSource = DB.UserProfiles;
            grid.DataSource = dataSource.Where(x => x.IdEmpresa==IDEmpresa).OrderBy(x=>x.UserName); -->fetch all users of a company.
            //and use the GetData() method to return the results
            return grid.GetData(path, layout);
        }


    }

my class Company

public class Company
    {
        [Key]
        public int IDEmpresa { get; set; }
        public string NomeEmpresa { get; set; }
        public string NIF { get; set; }
        public string Observacoes { get; set; }
        public int IDP { get; set; }
        public int IDU { get; set; }
        public DateTime TStamp { get; set; }
        public int Rem { get; set; }
        public String TipoCliente { get; set;}
    }

and for the user i am using the simplemenbership class that were created..

the user contain the username, password, name and some other fields..

then i have user profile table, this table tell me wich users are related with which company.

so a company can have multiple employees(Utilizadores).

in order to find the id of company i do the split of the string path...but i think this is wrong...because on our sample you use foreign key...and in mine i dont.

by the method i discribed the problem lays, i think ,if the grid has more thant 2 levels...

i found this way of doing things and it is working..

but if i followed this way wouldnt bring more problems along the way..

Or is there a better way?

Thanks...

i manage to get it working last night...~

the processo class

public class Processo
{
[Key]
public int IDProcesso { get; set; }
public int IDCliente { get; set; }
public DateTime DataInserido { get; set; }

public int Estado { get; set; }
public int IDU { get; set; }
public int Rem { get; set; }
public DateTime TStamp { get; set; }

}

the view model Client

public class Hierarchicalgrid
{

public int IDCliente { get; set; }
public string NomeCliente { get; set; }

public List<Processo> Processos { get; set; }

public static IQueryable<Hierarchicalgrid> GetListProcessos()
{
MvcIdonic db = new MvcIdonic();

var processos = (from c in db.Clientes
//join p in db.Processos on c.IDCliente equals p.IDCliente
orderby c.Nome descending
where c.Rem == 0
select new { IDCliente = c.IDCliente, NomeCliente = c.Nome }).ToList().Select(c => new Hierarchicalgrid
{
IDCliente = c.IDCliente,
NomeCliente = c.NomeCliente,
Processos=GetListProcessosByIDCliente(c.IDCliente)
});

return processos.AsQueryable<Hierarchicalgrid>();

}

private static List<Processo> GetListProcessosByIDCliente(int p)
{
MvcIdonic db = new MvcIdonic();
List<Processo> ListP = new List<Processo>();
ListP = db.Processos.Where(x => x.IDCliente == p).ToList();
return ListP;
}
}

the view.cshtml

@(Html.Infragistics().Grid <Licenciamento_v2.Areas.Idonic.ViewModels.Hierarchicalgrid>()

.AutoGenerateColumns(false)
.AutoGenerateLayouts(false)
.Caption("Processo")
.ID("grid_Processo")

.Columns( cols=>{
cols.For(x => x.IDCliente).HeaderText("ID");
cols.For(x => x.NomeCliente).HeaderText("Name");

})
.ColumnLayouts( layout=>{
layout.For(x => x.Processos).Columns(cols=>{
cols.For(x => x.IDProcesso).HeaderText("ID");
cols.For(x => x.DataInserido).HeaderText("Name");
cols.For(x => x.IDCliente).HeaderText("CustomerID");
});
})
.DataSourceUrl(Url.Action("ListarProcessos2"))
.Width("400px")

.DataBind()
.Render()
)

the controller

[GridDataSourceAction]
public ActionResult ListarProcessos2()
{
return View(Licenciamento_v2.Areas.Idonic.ViewModels.Hierarchicalgrid.GetListProcessos());
}

Now how can i transform this code to load on demand...

i am currently creating a similar sample project wit companys and user...

but i want to add the load on demand part..

How can i do that...

thanks