diffirent behaviour between IE40 and Navigator 404

SDK 1.01
Development platform Win95
I write some code :import java.applet.*;
import java.awt.*;

public class j2 extends Applet
{
      Button bt=new Button("Quit");
      TextArea ta=new TextArea(" ");
           public void init()
      {
       
              add(bt);
              add(ta);
                  resize(420, 240);
      }

      public boolean handleEvent(Event evt)
      {
      switch(evt.id)
      {
      case Event.MOUSE_DOWN :
            if(evt.metaDown())
             ta.appendText("Mouse right down\r\n");
            else
             ta.appendText("Mouse down\r\n");
      return true;
      default :
            return false;
      }
}


}
in Navigator when I click right button at anywhere in the applet a property sheet and a string "Mouse right down" appear (it mean I can handle that event)
but in IE40 if I click right button on "Quit" button or on text area string "Mouse right down " doesn't appear .
what wrong with my code ?
Thanks in advance.