code: @Override
      protected void onComponentTag(final ComponentTag _tag)
      {
          if (this.actionUrl == null) {
              this.actionUrl = urlFor(getRequestCycle().getActiveRequestHandler()).toString();
          }
          super.onComponentTag(_tag);
          if (getPage().getDefaultModelObject() != null) {
              // only on SearchMode we want normal submit, in any other case we
              // use AjaxSubmit
              if (getPage().getDefaultModelObject() instanceof AbstractUIObject
                              && !((AbstractUIObject) getPage().getDefaultModelObject()).isSearchMode()) {
                  //_tag.put("onSubmit", "return false;");
                  _tag.put("action", "");
              }
          }
      }
docs: On component tag.
  
  @param _tag the tag
  
  @see org.apache.wicket.markup.html.form.Form
  #onComponentTag(org.apache.wicket.markup.ComponentTag)