title: cannot call methods on [widget name] prior to initialization
body: <p>I have initialized my plugin but I keep getting <code>cannot call methods on collapsableTabs prior to initialization</code> when I try to call a method in the plugin.</p>
  
  <p>The plugin is loaded and appears fine. I have an input control on the page:</p>
  
  <pre><code>&lt;input type="button" id="allOptions" value="Options:" onclick="javascript:populateOptions();" /&gt;
  </code></pre>
  
  <p>...</p>
  
  <pre><code>function populateOptions() 
  { 
    var optionSelector = $(this).collapsableTabs('allOptions'); &lt;-- FAILS 
  } 
  </code></pre>
  
  <p>When I click on the button, I get the <code>error</code> message. </p>
  
  <p>How do I get around this?</p>