<SelectField
         hintText="Sites"
         value={this.state.value}
          onChange={(event, value) => this.handleChange(event, value)}
          fullWidth={true} >
          {sites.map((site, index) => {
               if (site.subject) {
                   return <MenuItem key={index} value={index} primaryText={site.subject + ' (' + site.id + ')'} />
                } else {
                   if (site.extId) {
                         return <MenuItem key={index} value={index} primaryText={site.extId + ' (' + site.id + ')'} />
                 }
                 return <MenuItem key={index} value={index} primaryText={site.id} />
                 }
            })}
</SelectField>