has anyone succeded implementing buttons of tinymce "rtl" and "ltr" in umbraco 7 ?

in umbraco 6 i added the following code to tinymce.config

<command>
      <umbracoAlias>ltr</umbracoAlias>
      <icon>images/editor/ltr.gif</icon>
      <tinyMceCommand value="" userInterface="false" frontendCommand="ltr">ltr</tinyMceCommand>
      <priority>76</priority>
    </command>
    <command>
      <umbracoAlias>rtl</umbracoAlias>
      <icon>images/editor/rtl.gif</icon>
      <tinyMceCommand value="" userInterface="false" frontendCommand="rtl">rtl</tinyMceCommand>
      <priority>77</priority>
</command> 

<plugin loadOnFrontend="false">directionality</plugin>

<config key="directionality">rtl</config>

 but i can't get the images to show on tinymce toolbar.