title: RadioGroup inside an AlertDialog : only single RadioButton shown
body: <p>I'm trying to set up a RadioGroup inside an AlertDialog. I'm using the following construct for that.</p>
  
  <pre><code>new AlertDialog.Builder(this)
              .setTitle("Set icon for " + item_cursor.getString(1))
              .setView(radioGroupView)
              .setPositiveButton("Ok",
                      new DialogInterface.OnClickListener() {
                  public void onClick(DialogInterface dialog,
                          int whichButton) {
                      RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radiogroup);
                      int checkedRadioButton = 0;
                      try {
                          checkedRadioButton = radioGroup.getCheckedRadioButtonId();
                      } catch (Exception e) {
                          e.printStackTrace();
                      }
                      int i =0;
                      switch (checkedRadioButton) {
                      case R.id.a2s :
                      datasource.updateIcon(i,itemid);
                      break;
                      case R.id.android: i=1;
                      datasource.updateIcon(i,itemid);
                      break;
                      }
                  }
              }).setNegativeButton("Cancel",
              new DialogInterface.OnClickListener() {
                  public void onClick(DialogInterface dialog,
                          int whichButton) {
                      // Canceled.
                  }
              }).show();
  </code></pre>
  
  <p>But the alertDialog only shows one Radiobutton. Following is the XML seticon.xml :</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent" android:layout_height="fill_parent"
      android:orientation="vertical"&gt;
      &lt;RadioGroup android:layout_width="fill_parent"
          android:layout_height="wrap_content" android:orientation="horizontal"
          android:id="@+id/radiogroup"&gt;
          &lt;RadioButton android:id="@+id/android"
              android:layout_width="fill_parent" android:layout_height="wrap_content"
              android:text="Android" /&gt;
          &lt;RadioButton android:id="@+id/a2s" android:layout_width="fill_parent"
              android:layout_height="wrap_content" android:text="Argen2Stone ROM" /&gt;
      &lt;/RadioGroup&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>Why does this happen?</p>