EDIT

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.widgets.Button;

import eu.etaxonomy.taxeditor.view.search.facet.CheckBoxSearchResultComposite;

        TermSearchResultComposite comp = new TermSearchResultComposite(result, parent, SWT.NONE);

        comp.getBtnCheck().addSelectionListener(new SelectionListener() {

            @Override

            public void widgetSelected(SelectionEvent e) {

                @SuppressWarnings("rawtypes")

                Button selectedComp =  (Button) e.widget;

                boolean selected = selectedComp.getSelection();

                for (CheckBoxSearchResultComposite comp: getSearchResultComposites()){

                    comp.getBtnCheck().setSelection(false);

                }

                selectedComp.setSelection(selected);

                page.setPageComplete(selected);

            }

            @Override

            public void widgetDefaultSelected(SelectionEvent e) {

                // TODO Auto-generated method stub

            }

        });

        return comp;