informationText =  new  StyledText(informationComposite, SWT.BORDER | SWT.HORIZONTAL | SWT.VERTICAL | SWT.MULTI);
informationText.addListener (SWT.?????,  new  Listener () {
     public   void  handleEvent (Event event) {
                String contents = informationText.getText();
                 if  (!contents.equals("")){//??
                    StyleRange style =  new  StyleRange();
                    style.start =  0 ;
                    style.length =  10 ;
                    style.background = getDisplay().getSystemColor(SWT.COLOR_RED);
                    informationText.setStyleRange(style);
                } 
            }
});