title: Get datagrid rows
body: <p>How can I get the list of rows in the DataGrid? Not the bound items, but the 
  <code>DataGridRows</code> list.</p>
  
  <p>I need to control the visibility of these rows and it's only possible to control it as a <code>DataGridRow</code> and not as a data object.</p>
  
  <p>Thanks!</p>