title: lwuit calendar with button event
body: <p>i tried to show the calendar on button click using form but i'm unable to <em>change the date</em> and very much struggled to find where the <em>focus</em> .</p>
  
  <pre><code>    ...
      Button mdate=new Button("change date");
      mdate.addActionListener(this);
      ...
      public void actionPerformed(ActionEvent ae) {
         Form cal= new Form();
         com.sun.lwuit.Calendar c =new com.sun.lwuit.Calendar();
         c.setFocus(true);
         c.addActionListener(this);
         cal.addComponent(c);
         cal.show();
      }
  </code></pre>
  
  <p>how to show and hide calendar on button click in a better way</p>