protected ConfigurableCompletionProposal doCreateProposal(String proposal,
StyledString displayString, Image image, int replacementOffset,int replacementLength) {
       return new MydslConfigurableCompletionProposal(proposal,      replacementOffset,replacementLength,displayString, image);
}

public class MyDSLCompletionProposal extends ConfigurableCompletionProposal {

public ConfigurableCompletionProposal(....){
   super(....);
}

public IInformationControl getInformationControlCreator(){
System.out.println("getInformationControlCreator");
return new IInformationControlCreator() {
  @Override
  public IInformationControl createInformationControl (Shell parent){
     System.out.println("broswer");
     BrowserInformationControl browser = new BrowserInformationControl(parent, null,  false);
     return browser;
  }
}
}

public IInformationControlCreator getInformationControlCreator() {
	return new AbstractReusableInformationControlCreator() {
                 public IInformationControl doCreateInformationControl(Shell parent) {
		         return new BrowserInformationControl(parent, JFaceResources.DIALOG_FONT, false);
	         }
        };
}