public void RegisterPendingChange(DatabaseCommand command, object contributer)
{
if (command != null)
{
command.CheckPermissions(User);
_pendingChanges.Add(command);
if (contributer is IChangeContainerObserver && !_observers.Contains(contributer))
{
_observers.Add(contributer as IChangeContainerObserver);
}
if (ChangeRegistered != null)
{
ChangeRegistered(this, command);
}
}
}