<div ng-controller="Umbraco.PropertyEditors.RTEController" class="umb-editor umb-rte">
    <div ng-if="isLoading">Loading...</div>
    <textarea ng-style="{ visibility :  isLoading ? 'hidden' : 'visible'}" 
              ng-model="model.value" rows="10" id="{{model.alias}}_rte"></textarea>
</div>