<background-position>
<item>
<label i18n="true">plugin.skinfactory:PLUGINS_SKINFACTORY_BACKGROUND_POSITION_DEFAULT</label>
<value>initial</value>
</item>
<item>
<label i18n="false">left top</label>
<value>left top</value>
</item>
<item>
<label i18n="false">left bottom</label>
<value>left bottom</value>
</item>
<item>
<label i18n="false">right top</label>
<value>right top</value>
</item>
<item>
<label i18n="false">right bottom</label>
<value>right bottom</value>
</item>
</background-position>
<background-repeat>
<item>
<label i18n="true">plugin.skinfactory:PLUGINS_SKINFACTORY_BACKGROUND_REPEAT_DEFAULT</label>
<value>initial</value>
</item>
<item>
<label i18n="true">plugin.skinfactory:PLUGINS_SKINFACTORY_BACKGROUND_REPEAT_NO</label>
<value>no-repeat</value>
</item>
<item>
<label i18n="true">plugin.skinfactory:PLUGINS_SKINFACTORY_BACKGROUND_REPEAT_REPEAT</label>
<value>repeat</value>
</item>
<item>
<label i18n="true">plugin.skinfactory:PLUGINS_SKINFACTORY_BACKGROUND_REPEAT_REPEAT_X</label>
<value>repeat-x</value>
</item>
<item>
<label i18n="true">plugin.skinfactory:PLUGINS_SKINFACTORY_BACKGROUND_REPEAT_REPEAT_Y</label>
<value>repeat-y</value>
</item>
</background-repeat>
<border-radius>
<item>
<label i18n="false">0px</label>
<value>0px</value>
</item>
<item>
<label i18n="false">1px</label>
<value>1px</value>
</item>
<item>
<label i18n="false">2px</label>
<value>2px</value>
</item>
<item>
<label i18n="false">3px</label>
<value>3px</value>
</item>
<item>
<label i18n="false">4px</label>
<value>4px</value>
</item>
</border-radius>
Do not forgot to add your allowed CSS styles for these 3 CSS properties in the file css-styles.xml of your model