In file mfrh_class.settings-api.php:
166     function callback_multicheck( $args ) {
167         $value = $this->get_option( $args['id'], $args['section'], $args['std'] );
168         
169         $html = '';
170         foreach ( $args['options'] as $key => $label ) {
171             $checked = isset( $value[$key] ) ? $value[$key] : '0';
172             $html .= sprintf( '', $args['section'], $a    rgs['id'], $key, checked( $checked, $key, false ) );
173             $html .= sprintf( ' %3$s
', $args['section'], $args['id'], $label, $key );
174         }   
175         $html .= sprintf( ' %s', $args['desc'] );
176         
177         echo $html;
178     }   


    function callback_radio( $args ) {
186 
187         $value = $this->get_option( $args['id'], $args['section'], $args['std'] );
188         
189         $html = '';
190         foreach ( $args['options'] as $key => $label ) {
191             $html .= sprintf( '', $args['section'], $args['id'], $    key, checked( $value, $key, false ) );
192             $html .= sprintf( ' %3$s
', $args['section'], $args['id'], $label, $key );
193         }   
194         $html .= sprintf( ' %s', $args['desc'] );
195         
196         echo $html;
197     }


 function callback_wysiwyg( $args ) {
250 
251         $value = wpautop( $this->get_option( $args['id'], $args['section'], $args['std'] ) );
252         $size = isset( $args['size'] ) && !is_null( $args['size'] ) ? $args['size'] : '500px';
253 
254         echo '
';
255 
256         wp_editor( $value, $args['section'] . '[' . $args['id'] . ']', array( 'teeny' => true, 'textarea_rows' => 10 ) );
257 
258         echo '
';
259 
260         echo sprintf( '
 %s', $args['desc'] );
261     }