Créer une boite de dialogue

Bonjour,
J'ai crée une boite de dialogue mais lorsque je lance la boite de dialogue rien apparait seulement un rectangle blanc avec un trait bleu tous en bas .

Code:

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public class MainActivity extends ListActivity  {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
     getListView().setOnItemClickListener(SupModifOnItemClick);
  }
 
   private ListView.OnItemClickListener SupModifOnItemClick = new AdapterView.OnItemClickListener() {
 
        public void onItemClick(AdapterView<?> a, View v, int position, long id) {
 
            Item  t = (Item) a.getItemAtPosition(position);
            FragmentManager manager = getFragmentManager();
            Dial d = new Dial(t);
            d.show(manager,"Boite de dialogue");
        }
 
    };
}

Ma boite de dialogue

Code:

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public class Dial extends DialogFragment {
    public View onCreateview(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View v = inflater.inflate(R.layout.boite_de_dialogue,null);
        return v;
    }
}

Code:

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
 
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:id="@+id/textView"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"/>
 
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Modifier"
        android:id="@+id/modifier"
        android:layout_alignParentLeft="@+id/textView"
        android:layout_below="@id/textView"/>
 
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Supprimer"
        android:id="@+id/supprimer"
        android:layout_below="@id/textView"
        android:layout_toRightOf="@+id/modifier"/>
</RelativeLayout>