group.toggle.updateTitle = function ( index, element ) {
        var $group = $( element ),
            $title = $group.find( '> .rwmb-group-title-wrapper > .rwmb-group-title, > .rwmb-input > .rwmb-group-title-wrapper > .rwmb-group-title' ),
            options = $title.data( 'options' );

        function processField( field ) {
            if ( -1 === content.indexOf( '{' + field + '}' ) ) {
                return;
            }

            var selectors = 'input[name*="[' + field + ']"], textarea[name*="[' + field + ']"], select[name*="[' + field + ']"], button[name*="[' + field + ']"]',
                $field = $group.find( selectors ),
                fieldValue = $field.val();

            if ( $field.is( 'select' ) && fieldValue ) {
                fieldValue = $field.find( 'option:selected' ).text();
            }

            content = content.replace( '{' + field + '}', fieldValue );

            // Update title when field's value is changed.
            if ( ! $field.data( 'update-group-title' ) ) {
                $field.on( 'keyup change', _.debounce( function () {
                    group.toggle.updateTitle( 0, element );
                }, 250 ) ).data( 'update-group-title', true );
            }
        }

        if ( 'undefined' === typeof options ) {
            return;
        }

        var content = options.content || '',
            fields = options.fields || [];

        content = content.replace( '{#}', index );
        fields.forEach( processField );

        $title.text( content );
    };