How do I create a new row on the Ultragrid?

Quick question about adding a new item when using binding sources. I have tried to use the Create method but it says that the properties I need to set are read only. The table is one-many table where the key's are values from other tables.

 

Table - PK

DataStore - DSId

Users - UserId

UserRights - DSId , UserId

 

In the UserRights BO I have the following:

    public static UserRights Create(PersistenceManager pManager, int dsId, int userId)
    {

 

        UserRights aUserRights = pManager.CreateEntity<UserRights>();

 

        // if this object type requires a unique id and you have implemented
        // the IIdGenerator interface implement the following line
        //pManager.GenerateId(aUserRights, // add id column here //);
        aUserRights.AddToManager();

 

        // Add custom code here
        aUserRights.Dsid = dsId;  -> says it is read only
        aUserRights.UserId = userId; -> says it is read only

 

        aUserRights.AddToManager();
        return aUserRights;
    }

 

 

How do I create a new row?