title: Where is the source for R.layout.date_picker_dialog
body: <p>Referring to the docs at <a href="http://developer.android.com/guide/topics/ui/controls/pickers.html" rel="nofollow">http://developer.android.com/guide/topics/ui/controls/pickers.html</a>. I am trying to merge DatePickerDialog and TimePickerDialog into one. But when I simply do</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/date_time_picker"
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:gravity="center"
      android:orientation="vertical"
      android:padding="5dip" &gt;
  
      &lt;TextView
          android:id="@+id/date_time_display"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:textColor="@color/holo_blue_bright" /&gt;
  
      &lt;View
          android:layout_width="match_parent"
          android:layout_height="2dp"
          android:background="#DDDDDD" /&gt;
  
      &lt;DatePickerDialog
          android:id="@+id/date_picker"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:calendarViewShown="false"
           /&gt;
  
      &lt;View
          android:layout_width="match_parent"
          android:layout_height="2dp"
          android:background="#DDDDDD" /&gt;
  
      &lt;TimePickerDialog
          android:id="@+id/time_picker"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>when I try to extract the view using</p>
  
  <pre><code>DatePickerDialog dateDialog = (DatePickerDialog) view.findViewById(R.id.date_picker);
  </code></pre>
  
  <p>I get the error message that I cannot cast from view to DatePickerDialog. So I open the source of DatePickerDialog to see how to create my own. But I can't find the source for R.layout.date_picker_dialog. Does anyone know how to open that xml file?</p>