@(Html.Kendo().Grid((IEnumerable<Doc.Web.Models.Common.ContactModel>)Model.contact_lst)  
    .Name("grid")
    .Columns(columns =>
    {

        columns.Bound(o => o.ContactID).Visible(false);
        columns.Bound(o => o.ContactName).Title("Contact Name");
        columns.ForeignKey(p => p.CPOID, (System.Collections.IEnumerable)ViewData["CPOs"], "cpo_id", "contract_po")
                .Title("Company - Contact/Purchase Order");
        columns.Command(command => { command.Edit(); command.Destroy(); }).Width(182);
    })
    .ToolBar(toolbar => toolbar.Create())
    .Editable(editable => editable.Mode(GridEditMode.InLine))
    .Pageable()
    .Sortable()
    .Filterable()
    .ToolBar(toolbar =>
    {
        toolbar.Template(@<text>
           <div class="toolbar">
               <a href="/Contact/EditingInline_Read?grid-mode=insert" class="k-button k-button-icontext k-grid-add">
    <span class="k-icon k-add"></span>Add New Record
</a>
                    <label class="category-label" for="category">Site:</label>
                       @(Html.Kendo().DropDownListFor(m => m.SiteID)
                            .Name("SiteID")
                            .DataTextField("Text")
                            .DataValueField("Value")
                            .Events(e => e.Change("categoriesChange"))
                            .Value(Model.SiteID.ToString())
                            .DataSource(ds =>
                            {
                                ds.Read("ToolbarTemplate_Categories", "Contact");
                            })
                        ) 

                        </div>

        </text>);
    })
    .DataSource(dataSource => dataSource
        .Ajax()
        .PageSize(20)
        .Events(events => events.Error("error_handler"))
        .Model(model => model.Id(p => p.ContactID))
        .Create(update => update.Action("EditingInline_Create", "Contact").Data("additionalInfo"))
        .Read(read => read.Action("EditingInline_Read", "Contact").Data("additionalInfo"))
        .Update(update => update.Action("EditingInline_Update", "Contact").Data("additionalInfo"))
        .Destroy(update => update.Action("EditingInline_Destroy", "Contact").Data("additionalInfo"))

    )
)

Ich möchte die Fremdschlüsselspaltenwerte bei einem Änderungsereignis der SiteID-Dropdown-Liste neu binden, die sich in der Kopfzeilenvorlage befindet. Ich habe es im Rahmen des Ereignisses "EditingInline_Read" versucht, aber die ViewBag-Werte werden nicht aktualisiert. Irgendwelche Vorschläge?