Setting Spinner background color makes it's disappear

<com.parse.ui.NoDefaultSpinner
        android:id="@+id/schools_spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:popupBackground="#0FFFFF"
        android:background="#0FFFFF"
        android:prompt="@string/select_school" />

If I set the background color for the spinner it disappears, but if I remove it then it's fine. The poupBackground works great however. Anyone know why?