}
@Override
public void runWithEvent(Event event) {
Shell parentShell = event.display.getActiveShell();
GroupByDialog dialog = new GroupByDialog(parentShell);
dialog.create();
dialog.getShell().setSize(400, 400);
dialog.setSelectedCategories(provider.getSelected());
dialog.setUnSelectedCategories(provider.getUnselected());
if (dialog.open() == GroupByDialog.OK) {
provider.setSelected(dialog.getSelectedCategories());
}
}