EDIT

    private StackLayout stackLayout;

    @PostConstruct

    public void create(Composite parent, IEclipseContext context) {

        if(CdmStore.isActive() && conversation==null){

        stackLayout = new StackLayout();

        parent.setLayout(stackLayout);

        matrix = new CharacterMatrix(parent, this);

        label.setText(Messages.CharacterMatrixPart_LOADING_MATRIX);

        stackLayout.topControl = label;

        ContextInjectionFactory.inject(matrix, context);

                    || descriptiveDataSet.getDescriptiveSystem().getTermType()==null

                    || !descriptiveDataSet.getDescriptiveSystem().getTermType().equals(TermType.Character)){

                MessagingUtils.informationDialog(Messages.CharacterMatrixPart_COULD_NOT_OPEN, Messages.CharacterMatrixPart_COULD_NOT_OPEN_MESSAGE);

                return;

            }

            matrix.initDescriptiveDataSet();

        return propertyMap;

    }

        stackLayout.topControl = matrix;

        matrix.getParent().layout();

    }