r</option>
        <option><img src="theme:v-trackbar-thumb-left-pressed">theme:v-trackbar-thumb-left-pressed</option>
        <option><img src="theme:v-trackbar-thumb-left-disabled">theme:v-trackbar-thumb-left-disabled</option>
        <option><img src="theme:v-trackbar-thumb-right-normal">theme:v-trackbar-thumb-right-normal</option>
        <option><img src="theme:v-trackbar-thumb-right-hover">theme:v-trackbar-thumb-right-hover</option>
        <option><img src="theme:v-trackbar-thumb-right-pressed">theme