How to reload data with Telerik().TreeView() in mvc3

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C#

ASP.NET

MVC3

i want to add a search button above the TreeView control,but i don't know how to reload the datasource,and how to do in the controller?
this is my view code:

@(Html.Telerik().TreeView()
                .Name(Model.ValueControlId + "projectroom-treeview")
                        .BindTo(Model.AvailableProjectRooms, mappings =>
                        {
                            mappings.For<ProjectRoom>(binding => binding
                                    .ItemDataBound((item, projectRoom) =>
                                    {
                                        item.Value = projectRoom.RoomGUID.ToString();
                                        item.Text = projectRoom.RoomName;
                                        item.ImageUrl = null;
                                        item.Expanded = true;
                                        item.Selected = projectRoom.RoomGUID == Model.SelectedRoomGUID;
                                    }));
                        })
        .ClientEvents(events => events
                        .OnSelect("onSelectMessage")
                )
        )