I am using the latest version - 2014.2

I am using the MVC helper:

                                            @(Html.Infragistics().ComboFor(item => item.RentalLocationID)
                                            .Width("100%")
                                            .Height("34px")
                                            .ValueKey("LocationID")
                                            .TextKey("Location")
                                            .ItemTemplate("Branch: ${BranchName}")
                                            .CompactData(false)
                                            .DataSourceUrl(Url.Action("location-combo-data"))
                                            .DataBind()
                                            .Render()
                                            )

With the data model:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Web.Models
{
    [Serializable]
    public class LocationComboList
    {
        public int LocationID { get; set; }
        public string Location { get; set; }
        public string BranchName { get; set; }
    }
}

With this controller action:

        [ComboDataSourceAction]
        [ActionName("location-combo-data")]
        public ActionResult ComboDataLocation()
        {
            commonRepository = new CommonRepository();
            IEnumerable<LocationComboList> locationComboList = commonRepository.GetLocationsComboList();
            return View(locationComboList);
        }

GetLocationsComboList is filling the model correctly, the problem appears to be returning the model to the view.

I also tried this in your sample project and it did not work there either. I changed asp-mvc-helper to

    @using (Html.BeginForm())
    {
        <div class="sample-ui">
            @Html.HiddenFor(item => item.OrderID)

            <div>
                <h4>Current Employee:</h4>
                @Html.DisplayFor(item => item.EmployeeName)
            </div>

            <div>
                <h4>Choose New Employee</h4>

                @(Html.Infragistics().ComboFor(item => item.EmployeeID)
                    .Width("270px")
                    .DataSourceUrl(Url.Action("employee-combo-data"))
                    .ValueKey("ID")
                    .TextKey("Name")
                    .ItemTemplate("${Name} Title: ${Title}")
                    .CompactData(false)
                    .DataBind()
                    .Render()
                )
            </div>

            <input id="submitBtn" type="submit" value="Update" />
        </div>
    }
</body>
</html>

It shows the name and the tiitle literal but not the title.

Hello Larry,

Thank you for the update.

The CompactData option doesn't appear to be working as expected. For this reason, I have asked our Product Development team to examine this further. To ensure that it will receive attention, I have logged this behavior in our internal tracking system with a Development ID of 171369.  The next step will be for a developer to review my investigation and confirm my findings or to offer a fix, or other resolution. 

I will be sure to post the resolution onto this forum thread as soon as it is available.