assets/UIUtility.qml
import bb.cascades 1.0
QtObject {
    function actionBarPlacementSignature() {
        return ActionBarPlacement.OnBar
    }
}

assets/mindw0h0du/UIUtility.qml
import bb.cascades 1.3

QtObject {
    function actionBarPlacementSignature() {
        return ActionBarPlacement.Signature
    }
}

assets/SomePage.qml
Page {
    actions: [
        ActionItem {
            title: "Something"
            ActionBar.placement: uiutil.actionBarPlacementSignature()
        }
    ]
    attachedObjects: [
        UIUtility {
            id: uiutil
        }
    ]
}