code: protected Object getValue4Wizard(final String _key)
      {
          Object ret = null;
          final Map<String, String[]> para = this.wizard.getParameters((IWizardElement) this);
          if (para != null && para.containsKey(_key)) {
              final String[] value = para.get(_key);
              ret = value[0];
          }
          return ret;
      }
docs: Method to get the value for a key in case of wizard.
  
  @param _key key for the value
  @return value for the object, if found, else null