layout_data = new GridData();
layout_data.grabExcessHorizontalSpace=true;
layout_data.horizontalAlignment = SWT.RIGHT;
button_ok.setLayoutData(layout_data);
button_ok.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent arg0) {
long min_unit = (Long)min_file_size_units.getData(min_file_size_units.getText());
long max_unit = (Long)max_file_size_units.getData(max_file_size_units.getText());
double min = formatSize(file_size_slider.getDownValue(), min_unit);
double max = formatSize(file_size_slider.getUpValue(), max_unit);