title: ag-grid load a table with a row selected
body: <p>I am refreshing the grid every second or so.  Once a row is selected, I want to keep the same row selected on the next refresh.  Is there a way to load the table with a row selected to maintain a stable selection (so that the user will feel that the row is always selected even with data refresh)?</p>
  
  <p>Also, on every refresh, the rowData is a different object reference.</p>