kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/job/SendBackwardJob.java [48:76]:
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        super(editorController);
    }

    @Override
    public boolean isExecutable() {
        final Selection selection = getEditorController().getSelection();
        if (selection.getGroup() instanceof ObjectSelectionGroup == false) {
            return false;
        }
        final ObjectSelectionGroup osg = (ObjectSelectionGroup) selection.getGroup();
        for (FXOMObject item : osg.getSortedItems()) {
            final FXOMObject previousSlibing = item.getPreviousSlibing();
            if (previousSlibing == null) {
                return false;
            }
        }
        return true;
    }

    @Override
    protected List<Job> makeAndExecuteSubJobs() {

        assert isExecutable(); // (1)
        final List<Job> result = new ArrayList<>();

        final Selection selection = getEditorController().getSelection();
        assert selection.getGroup() instanceof ObjectSelectionGroup; // Because of (1)
        final ObjectSelectionGroup osg = (ObjectSelectionGroup) selection.getGroup();
        final List<FXOMObject> candidates = osg.getSortedItems();
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kit/src/main/java/com/oracle/javafx/scenebuilder/kit/editor/job/SendToBackJob.java [49:77]:
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        super(editorController);
    }

    @Override
    public boolean isExecutable() {
        final Selection selection = getEditorController().getSelection();
        if (selection.getGroup() instanceof ObjectSelectionGroup == false) {
            return false;
        }
        final ObjectSelectionGroup osg = (ObjectSelectionGroup) selection.getGroup();
        for (FXOMObject item : osg.getSortedItems()) {
            final FXOMObject previousSlibing = item.getPreviousSlibing();
            if (previousSlibing == null) {
                return false;
            }
        }
        return true;
    }

    @Override
    protected List<Job> makeAndExecuteSubJobs() {

        assert isExecutable(); // (1)
        final List<Job> result = new ArrayList<>();

        final Selection selection = getEditorController().getSelection();
        assert selection.getGroup() instanceof ObjectSelectionGroup; // Because of (1)
        final ObjectSelectionGroup osg = (ObjectSelectionGroup) selection.getGroup();
        final List<FXOMObject> candidates = osg.getSortedItems();
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