- this.attachments.listenTo( this.controller, 'attachment:keydown:arrow', this.attachments.arrowEvent );
- this.attachments.listenTo( this.controller, 'attachment:details:shift-tab', this.attachments.restoreFocus );
+ this.controller.on( 'attachment:keydown:arrow', _.bind( this.attachments.arrowEvent, this.attachments ) );
+ this.controller.on( 'attachment:details:shift-tab', _.bind( this.attachments.restoreFocus, this.attachments ) );