code: void activateWidget() {
  
          if (m_activationHandlerRegistration != null) {
              m_activationHandlerRegistration.removeHandler();
              m_activationHandlerRegistration = null;
          }
          if ((m_widget != null) && !m_widget.isActive()) {
              m_widget.setActive(true);
              if ((m_defaultValue != null) && (m_defaultValue.trim().length() > 0)) {
                  m_widget.setValue(m_defaultValue, true);
              }
              m_handler.updateButtonVisisbility();
              removeStyleName(formCss().emptyValue());
          }
      }
docs: Activates the value widget if prNamet.<p>