.c-property-element(:class="propertyClass")
.tt-property-header(@click="setExpandedElement")
| Columns
transition(name="c-property-list-transition")
.c-element-properties(v-if="isExpandedElement")
.tt-property
.c-property-label Columns
.c-property-value
.column.c-property-value {{element.children.length}}