Alloy tabgroup with common toolbar below

I am trying to put together a UI in Alloy that would contain a tabgroup, but all the tabs would have a common toolbar control/view that would be below the taabgroup. When I try to put a tabgroup and another view in a container window (see below), I get an error on Android only - 'cannot add window/tabgroup to another window/tabgroup'. I have made things work for now by putting an instance of the toolbar in each tab window, but this terribly inefficient. What can I do to make this with just one of my 'control panel' views?

<Alloy>
    <Windowid id="mainWindow" class="container">
        <TabGroup id="tg">
            <Require src="ALL" id="tabCLALL"/>
            <Require src="MOI" id="tabCLMOI"/>
            <Require src="POI" id="tabCLPOI"/>
            <Require src="YAH" id="tabYAH"/>
        </TabGroup>
        <View id="cp" >
            <Require type="view" src="ControlPanel" id="controlPanel"/>
        </View> 
    </Window>
</Alloy>