title: Ionic 2 Add radio buttons to alert controller
body: <p>How to add radio buttons as inputs buttons in an alert controller in ionic 2?
  It works with check boxes, but i want to add radio button group with radio buttons to select only one option.</p>
  
  <pre><code>  advanceSearch(): void{
     let prompt = this.alertCtrl.create({
      title: 'something',
      message: 'Select option ',
      inputs : [
       {
         type:'checkbox',
         label:'something1'
       },
       {
         type:'checkbox',
         label:'something2'
        }
  
      ],
      buttons : [
       {
         text: "Cancel",
         handler: data =&gt; {
           console.log("cancel clicked");
         }
       },
       {
         text: "Search",
         handler: data =&gt; {
           console.log("search clicked");
         }
       }
      ]
      });
      prompt.present();
  }
  </code></pre>
  
  <p>`</p>
  
  <p>I want to change these check boxes to radio boxes.</p>