final IStructuredSelection selection = (IStructuredSelection) this.viewer
                .getSelection();

        if (selection.isEmpty()) {
            return;
        }

        if (selection.getFirstElement() instanceof ManhattanConnectionEditPart) {

            final ManhattanConnectionEditPart editPart =(ManhattanConnectionEditPart) selection
                    .getFirstElement();
            final DiagramFeatureProvider fp = (DiagramFeatureProvider) editPart
                    .getFeatureProvider();

            final Object association = fp
                    .getBusinessObjectForPictogramElement(editPart
                            .getPictogramElement());

            if (association instanceof BuisnessObject) {
             //invoke the deletion mechanism
             }