How to add a record to many to many link table using EF4.1 Fluent API?

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C#

entity-framework

I have class TaskStatus, that has collection of TaskTypes
public ICollection<tasktype> TaskTypes { get; set; }

And I have class TaskType, that has collection of TaskStatuses
public ICollection<taskstatus> TaskStatuses { get; set; }

So TaskStatus and TaskType are many to many related.
In DB I have table LinkTaskTypesToStatus with only 2 fields: FK_TaskStatus and FK_TaskType.

Using fluent API I've written:

modelBuilder.Entity<TaskStatus>().HasMany(t => t.TaskTypes).WithMany(t => t.TaskStatuses).Map(mc => { mc.ToTable("LinkTaskTypesToStatus"); mc.MapLeftKey("FK_TaskStatus"); mc.MapRightKey("FK_TaskType"); });

modelBuilder.Entity<TaskType>().HasMany(t => t.TaskStatuses).WithMany(t => t.TaskTypes).Map(mc => { mc.ToTable("LinkTaskTypesToStatus"); mc.MapLeftKey("FK_TaskType"); mc.MapRightKey("FK_TaskStatus"); });

But when I try to link task type with task status using

TaskTypes.Instance.PrintTask.TaskStatuses.Add(TaskStatuses.Instance.PrintTaskGeneratingTaskStatus);
context.SaveChanges();

it saves nothing. The only way to make a record to LinkTaskTypesToStatus is to use stored procedure

context.Database.ExecuteSqlCommand("EXECUTE AddLinkTaskTypesToStatus @TaskTypeId={0}, @TaskStatusId={1} ", TaskTypes.Instance.PrintTaskId, TaskStatuses.Instance.PrintTaskGeneratingTaskStatusId);

After it create record in LinkTaskTypesToStatus, but TaskTypes.Instance.PrintTask.TaskStatuses.Count=0 instead of 1. So it doesn't see new link in DB.

Could you help me is there is a way in Fluent API to achieve this?