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res/values/attrs.xml

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+<resources>
+
+    <!--
+         Declare custom theme attributes that allow changing which styles are
+         used for button bars depending on the API level.
+         ?android:attr/buttonBarStyle is new as of API 11 so this is
+         necessary to support previous API levels.
+    -->
+    <declare-styleable name="ButtonBarContainerTheme">
+        <attr name="buttonBarStyle" format="reference" />
+        <attr name="buttonBarButtonStyle" format="reference" />
+    </declare-styleable>
+
+</resources>