text: /**
   * @class Ext.field.RadioGroup
   * @extend Ext.field.FieldGroupContainer
   * @xtype radiogroup
   * 
   * This Field is useful for containing multiple {@link Ext.field.Radio radiofield}.
   *
   * It plots items into wither horizontal / vertical depending on 
   * {@link Ext.field.FieldGroupContainer#vertical} config properties.
   * 
   * # Example usage:
   *
   *            @example packages=[extangular]
   *            import { Component } from '@angular/core'
   *            declare var Ext: any;
   *
   *            @Component({
   *                selector: 'radiogroup-component',
   *                styles: [``],
   *                template: `
   *                  <formpanel
   *                       title="RadioGroup Example"
   *                       [width]="600"
   *                       [height]="400"
   *                       [fullscreen]="true"
   *                   >
   *                       <radiogroup 
   *                           [label]="'Two Columns'"
   *                           [vertical]="true"
   *                           [height]="100"
   *                       >
   *                           <radiofield
   *                               [label]="'Item 1'"
   *                               [name]="'rb'"
   *                               value="1"
   *                           >
   *                           </radiofield>
   *                           <radiofield
   *                               [label]="'Item 2'"
   *                               [name]="'rb'"
   *                               value="2"
   *                               [checked]="true"
   *                           >
   *                           </radiofield>
   *                           <radiofield
   *                               [label]="'Item 3'"
   *                               [name]="'rb'"
   *                               value="3"
   *                           >
   *                           </radiofield>
   *                           <radiofield
   *                               [label]="'Item 4'"
   *                               [name]="'rb'"
   *                               value="4"
   *                           >
   *                           </radiofield>
   *                           <radiofield
   *                               [label]="'Item 5'"
   *                               [name]="'rb'"
   *                               value="5"
   *                           >
   *                           </radiofield>
   *                           <radiofield
   *                               [label]="'Item 6'"
   *                               [name]="'rb'"
   *                               value="6"
   *                           >
   *                           </radiofield>
   *                       </radiogroup>
   *                   </formpanel>`
   *              })
   *            export class RadioGroupComponents  {}
   * 
   * @since 7.0
   */
     
  /**
   * @property {Boolean} isRadioGroup
   * The value `true` to identify an object as an instance of this or derived class.
   * @readonly
   */
  
  /**
   * @property {String} defaultType
   * Default item type in radio group
   * @readonly
   */
  
  /**
   * @cfg {Boolean} simpleValue
   * When set to `true` the `value` of this group of `radiofield` components will be
   * mapped to the `value` of the checked item.
   *
   * This field allows the `radiogroup` to participate in binding an entire group of
   * radio buttons to a single value.
   */
  
  /**
   * @method getChecked
   * return first checked radio field from group
   */
  
  /**
   * @method setValue
   * Sets the checked status of the radio group.
   * If {@link #simpleValue `simpleValue`} is `true`, 
   * value must be a single value, the child radiobutton matching the value
   * will be checked. If `simpleValue` is not used, value must be an object of name-value
   * pairs, each child radiobutton matching the name and value will be checked.
   * @param {String/Object} value Checked value, or the value of the sibling radio button
   * to check.
   * @return {Ext.field.RadioGroup} this
   */
     