title: What's the best way to add add 'All' value to <Select> Control?
body: <p>//Update: I use this <code>&lt;select&gt;</code> control in <a href="https://sapui5.hana.ondemand.com/explored.html#/sample/sap.ui.comp.sample.filterbar.example2/preview" rel="nofollow noreferrer">Filter Bar</a></p>
  
  <p>In  control of UI5，if I select one item, I can't go back to non-selected state, so I want to add 'All' value in items: </p>
  
  <p>This works: </p>
  
  <pre><code>&lt;Select&gt;
      &lt;core:Item key="" text="All" /&gt;
      &lt;core:Item key="another value" text="another value"/&gt;
  &lt;/Select&gt;
  </code></pre>
  
  <p>But "All" disapear in this example: </p>
  
  <pre><code>&lt;Select
      items="{
          path: '/PRODUCTS'
      }"&gt;
      &lt;core:Item key="" text="All" /&gt;
      &lt;core:Item key="{ID}" text="{Route_Name}" /&gt;
  &lt;/Select&gt;
  </code></pre>
  
  <p>What should I do? </p>