title: Get selected items from a table with growing threshold SAPUI5
body: <p>I'm wondering if there is a way to get all the total number of selecteditems of a table with properties <code>growing</code> and <code>growingThreshold</code> set. It seems like the call
  <code>oTable.getSelectedItems().length</code> only works for items in the table that are on display/visible. </p>
  
  <p><a href="https://jsbin.com/quyude/2/edit?html,js,output" rel="nofollow noreferrer">JSBIN Sample</a></p>