title: R.java file not updating with UI element's id
body: <p>I added some UI elements to the main.xml file in the res\layout folder and when I try to access them through the call, <code>R.layout.my_uielement</code>, the UI element that I created is not there. Even when I add a new xml file with UI elements, it still doesn't show up in the <code>R.layout</code> class. I have made checked the ids on them and they have the correct format (I think): <code>android:id="@+id/my_button"</code>. What could be the problem? Do I need to compile the code first?<br>
  <b>UPDATE</b>:<br>
  I have already tried <code>adb kill-server</code> then <code>adb start-server</code>. It doesn't seem to help. I have also tried <code>R.id.my_uielement</code>, it doesn't register either.</p>