data.widthHint = SIZING_SELECTION_WIDGET_WIDTH + 300; // fudge? I like fudge.
viewerComposite.setLayoutData(data);
viewer = CheckboxTableViewer.newCheckList(viewerComposite, SWT.BORDER);
viewer.getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
viewer.setLabelProvider(new WorkingSetLabelProvider());
viewer.setContentProvider(new ArrayContentProvider());
viewer.addFilter(new WorkingSetFilter(null));
viewer.setInput(window.getWorkbench().getWorkingSetManager()
.getWorkingSets());