code: function( bindingPoint ){
      var att = this.attachments[bindingPoint.toString()];
      if( att !== undefined ){
        var index = this.attachmentsList.indexOf( att );
        this.attachmentsList.splice( index, 1 );
        att._detach( bindingPoint );
      }
      delete this.attachments[bindingPoint.toString()];
    }
docs: The Fbo must be explicitely bound before calling this method