Newbie: How to create/show Customize tab on watch face?

Hai can someone please help me with this.
i've been make a properties.xml and settings.xml on my watch face resources, but the "Customize" tab still not showing on my watch faces. I want to use the "Customize" tab for changing skin on my watch face.

this is my properties.xml

<?xml version="1.0" encoding="UTF-8"?>
<resources>
  <properties>
    <!-- default skin = 1 -->
    <property id="skin" type="number">1</property>
  </properties>
</resources>

and this is my settings.xml

<?xml version="1.0" encoding="UTF-8"?>
<resources>
  <strings>
    <string id="title_choose_skin">Pilih Skin</string>
    <string id="label_skin_1">Skin 1</string>
    <string id="label_skin_2">Skin 2</string>
    <string id="label_skin_3">Skin 3</string>
    <string id="label_skin_4">Skin 4</string>
    <string id="label_skin_5">Skin 5</string>
  </strings>

  <settings>
    <!-- Wajib: title sebagai atribut; propertyKey menunjuk ke @Properties.skin -->
    <setting propertyKey="@Properties.skin" title="@Strings.title_choose_skin">
      <settingConfig type="list">
        <listEntry value="1">@Strings.label_skin_1</listEntry>
        <listEntry value="2">@Strings.label_skin_2</listEntry>
        <listEntry value="3">@Strings.label_skin_3</listEntry>
        <listEntry value="4">@Strings.label_skin_4</listEntry>
        <listEntry value="5">@Strings.label_skin_5</listEntry>
      </settingConfig>
    </setting>
  </settings>
</resources>

Thankyou.