title: How to set a label to mandatory in sapui5
body: <p>The final view should like this:</p>
  
  <p><img src="https://i.stack.imgur.com/wI0bI.png" alt="enter image description here"></p>
  
  <p>The code in view.xml like this:</p>
  
  <pre><code>    &lt;VBox height="90px"&gt;
          &lt;Label text="{i18n&gt;FISCALYEAR_LABEL}" mandatory="mandatory"/&gt;
          &lt;Select id="FiscalYear"
              items="{
                  path: '/FiscalYearSet',
                  sorter: { path: 'FiscalYearID' }
                }"&gt;
              &lt;core:Item key="{FiscalYearID}" text="{FiscalYearNum}" /&gt;
          &lt;/Select&gt;
          &lt;ComboBox
              items="{
                  path: '/FiscalYearSet',
                  sorter: { path: 'FiscalYearID' }
                }"&gt;
              &lt;core:Item key="{FiscalYearID}" text="{FiscalYearNum}" /&gt;
          &lt;/ComboBox&gt;
      &lt;/VBox&gt;
  </code></pre>
  
  <p>I set a property 'mandatory="mandatory"', but it does not work.</p>