title: dynamic radio button from java to zul zk
body: <p>Hello :) iam bootcamp java still learn more about java and framework zk</p>
  
  <p>anyone know how to create dynamic radio button such as data from database but 
  now i'm not use it.</p>
  
  <p>this is my source code for test
  <br>
  <br>
  radiobutton.zul</p>
  
  <pre><code>&lt;?page title="new page title" contentType="text/html;charset=UTF-8"?&gt;
  &lt;zk&gt;
  &lt;window title="Customer" border="normal" apply="org.zkoss.bind.BindComposer"
      viewModel="@id('vm') @init('vmd.RadioButton')"&gt;
       &lt;cell&gt; 
          &lt;vlayout&gt; 
              &lt;radiogroup id="radiogroup"&gt;
              &lt;/radiogroup&gt;
          &lt;/vlayout&gt; 
      &lt;/cell&gt;
  &lt;/window&gt;
  &lt;/zk&gt;
  </code></pre>
  
  <p><br>
  RadioButton.java
  <br></p>
  
  <pre><code>public class RadioButton {
  
      public Radiogroup getRadiogroup() {
          return radiogroup;
      }
  
      public void setRadiogroup(Radiogroup radiogroup) {
          this.radiogroup = radiogroup;
      }
  
      private Radiogroup radiogroup = new Radiogroup();
  
      @Init
      public void load() {
          ArrayList&lt;String&gt; columnEntries = new ArrayList&lt;String&gt;();
          columnEntries.add("a");
          columnEntries.add("b");
  
          for (String entry : columnEntries) {
              radiogroup.appendItem(entry, entry);
          }
          radiogroup.setVisible(true);
      }
  }
  </code></pre>
  
  <p>And Result from that code is no radio button and no error :*( please help me..</p>