public function updateCMSFields(FieldList $fields)
 {
     $fields->removeByName('Theme');
     if (Config::inst()->get('SiteConfig', 'can_select_theme')) {
         $themeDropdownField = new DropdownField("Theme", _t('SiteConfig.THEME', 'Theme'), $this->getAvailableThemesExtended());
         $themeDropdownField->setEmptyString(_t('SiteConfig.DEFAULTTHEME', '(Use default theme)'));
         $fields->addFieldToTab('Root.Theme', $themeDropdownField);
     }
     // Colors
     $fields->addFieldToTab('Root.Theme', new HeaderField('ColorH', _t('ThemeSiteConfigExtension.ColorH', 'Colors')));
     $fields->addFieldToTab('Root.Theme', $BaseColor = new MiniColorsField('BaseColor', _t('ThemeSiteConfigExtension.BaseColor', 'Base Color')));
     $BaseColor->setDescription(_t('ThemeSiteConfigExtension.BaseColorDesc', "The background color of your website"));
     $fields->addFieldToTab('Root.Theme', new MiniColorsField('PrimaryColor', _t('ThemeSiteConfigExtension.PrimaryColor', 'Primary Color')));
     $fields->addFieldToTab('Root.Theme', new MiniColorsField('HoverColor', _t('ThemeSiteConfigExtension.HoverColor', 'Hover Color')));
     $fields->addFieldToTab('Root.Theme', new MiniColorsField('SecondaryColor', _t('ThemeSiteConfigExtension.SecondaryColor', 'Secondary Color')));
     $fields->addFieldToTab('Root.Theme', new MiniColorsField('CtaColor', _t('ThemeSiteConfigExtension.CtaColor', 'Call To Action Color')));
     // Fonts
     $fields->addFieldToTab('Root.Theme', new HeaderField('FontsH', _t('ThemeSiteConfigExtension.FontsH', 'Fonts')));
     $fields->addFieldToTab('Root.Theme', $hf = new TextField('HeaderFont', _t('ThemeSiteConfigExtension.HeaderFont', 'Header Font')));
     $fields->addFieldToTab('Root.Theme', $hfw = new TextField('HeaderFontWeight', _t('ThemeSiteConfigExtension.HeaderFontWeight', 'Header Font Weight')));
     $fields->addFieldToTab('Root.Theme', $bf = new TextField('BodyFont', _t('ThemeSiteConfigExtension.BodyFont', 'Body Font')));
     $fields->addFieldToTab('Root.Theme', $bfw = new TextField('BodyFontWeight', _t('ThemeSiteConfigExtension.BodyFontWeight', 'Body Font Weight')));
     $fields->addFieldToTab('Root.Theme', $gf = new TextField('GoogleFonts', _t('ThemeSiteConfigExtension.GoogleFonts', 'Google Fonts')));
     $hf->setAttribute('placeholder', 'Arial, Helvetica, sans-serif');
     $bf->setAttribute('placeholder', 'Arial, Helvetica, sans-serif');
     $gf->setDescription('family=Open+Sans:400italic,400,600&subset=latin,latin-ext');
     // Images
     $fields->addFieldToTab('Root.Theme', new HeaderField('ImagesH', _t('ThemeSiteConfigExtension.ImagesH', 'Images')));
     $fields->addFieldToTab('Root.Theme', ImageUploadField::createForClass($this, 'Logo', _t('ThemeSiteConfigExtension.Logo', 'Logo')));
     $fields->addFieldToTab('Root.Theme', $icon = ImageUploadField::createForClass($this, 'Icon', _t('ThemeSiteConfigExtension.Icon', 'Icon')));
     $fields->addFieldToTab('Root.Theme', ImageUploadField::createForClass($this, 'FooterImage', _t('ThemeSiteConfigExtension.FooterImage', 'Footer Image')));
     if (is_file(Director::baseFolder() . $this->FaviconPath())) {
         $icon->setDescription(_t('ThemeSiteConfigExtension.FaviconPreview', 'Favicon preview') . ' <img src="' . $this->FaviconPath() . '" alt="Favicon" />');
     } else {
         $icon->setDescription(_t('ThemeSiteConfigExtension.NoFavicon', 'No favicon created for this site'));
     }
     $fields->addFieldToTab('Root.Theme', ImageUploadField::createForClass($this, 'BackgroundImages', _t('ThemeSiteConfigExtension.BackgroundImages', 'Background Images')));
     $fields->addFieldToTab('Root.Theme', new DropdownField('BackgroundRepeat', _t('ThemeSiteConfigExtension.BackgroundRepeat', 'Background Repeat'), array(self::BACKGROUND_NO_REPEAT => 'no repeat', self::BACKGROUND_REPEAT => 'repeat', self::BACKGROUND_REPEAT_X => 'repeat x', self::BACKGROUND_REPEAT_Y => 'repeat y')));
     if (Director::isDev() || Permission::check('ADMIN')) {
         $fields->addFieldToTab('Root.Theme', new HeaderField('ThemeDevHeader', 'Dev tools'));
         $fields->addFieldToTab('Root.Theme', new CheckboxField('RefreshTheme'));
         $fields->addFieldToTab('Root.Theme', new CheckboxField('RefreshIcon'));
     }
     // Simple Google Analytics helper, disable if other extension are found
     if (!$this->owner->hasExtension('GoogleConfig') && !$this->owner->hasExtension('ZenGoogleAnalytics')) {
         $fields->addFieldToTab('Root.Main', $ga = new TextField('GoogleAnalyticsCode'));
         $ga->setAttribute('placeholder', 'UA-0000000-00');
     }
     return $fields;
 }