content: import React from 'react';
  import { FormPanel, SelectField } from '@extjs/ext-react';
  
  Ext.require('Ext.Toast');
  
  export default function SelectFieldExample() {
      return (
          <FormPanel shadow>
              <SelectField 
                  label="Select"  
                  width="200"
                  onChange={(field, newValue) => Ext.toast(`You selected the item with value ${newValue}`)}
                  options={[
                      { text: '', value: null },
                      { text: 'Option 1', value: 1 },
                      { text: 'Option 2', value: 2 },
                      { text: 'Option 3', value: 3 }
                  ]}
              />
          </FormPanel>
      )
  }