}
}
});
classesviewer.setLabelProvider(new ClasspathLabelProvider());
classesviewer.getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
classesviewer.addCheckStateListener(new ICheckStateListener() {
public void checkStateChanged(CheckStateChangedEvent event) {
classesselection.setSelection((IPackageFragmentRoot) event.getElement(), event.getChecked());
classesviewer.setCheckedElements(classesselection.getSelectedRoots());
setDirty(true);
updateLaunchConfigurationDialog();