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

Question

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")

)

)