title: Android Theme.Dialog gives me an error
body: <p>When I want to add this code on my app it gives me this : "Unfortunately, MyApp has stopped".
  Is because I added this line : <code>android:theme="@android:style/Theme.Dialog"</code></p>
  
  <p>I tried to add this line too <code>android:theme="@android:style/Theme.Holo"</code> but is still not working</p>
  
  <pre><code>&lt;activity android:name=".About"  android:label="@string/about_title" android:theme="@android:style/Theme.Dialog"&gt; &lt;/activity&gt;
  </code></pre>
  
  <p>Please help me. Thanks</p>