title: table with multiselection and clickable row
body: <p>I already have a table - CellTable, with single selection model and i used onSelectionChange to find when row was clicked</p>
  
  <p>Next I added to that column which containes check box
  and here comes my problem</p>
  
  <p>if i use single selection model, when i tick one row, other row become unticked</p>
  
  <p>i tried to switch to multiselection model, but in this case, i can't click on row, and onSelectionChanges is executed only when i click on my check box, but i can tick more than one box</p>
  
  <p>is any chance how i can have both - multiselection and clickable row?
  regards</p>