Allineare una mini tastiera a destra (non funziona comando alignRight)

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android">

<com.android.keybee.LatinKeyboardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/keyboard"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_height="wrap_content"
android:keyBackground="@drawable/kb_exagon_base"/>
<Button
android:layout_width="5dp"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/keyboard"/>
</RelativeLayout>


mi da errore a runtime

sistemato:
RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" >

<com.android.keybee.LatinKeyboardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/keyboard"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"

android:keyBackground="@drawable/kb_exagon_base" />

<Button
android:layout_width="5dp"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/keyboard"/>
</RelativeLayout>



ora provo

scusate per i post, però dice che non si può fare un cast dall'input method