@Override
 protected void buttonPressed(int buttonId) {
   if (buttonId == OK) {
     selectesCSSStylesClasses = cssClassComposite.getCSSStyleClasses();
   }
   super.buttonPressed(buttonId);
 }
 @Override
 protected void configureShell(Shell newShell) {
   super.configureShell(newShell);
   newShell.setText(JstUIMessages.CSS_SELECTOR_TITLE);
 }