title: How can I get a datagrid to behave like the ctrl key is active?
body: <p>I want my data grid to behave by default as if the user is holding the control key down. So when an item is clicked, then another item they are both part of the selection, clicking them again removes them from the selection.</p>
  
  <p>I already have <code>allowMultipleSelection = true</code> but I can't seem to find any setting that does this. I'm working on the itemclick event in the meantime, but it seems like there might be an easy to use setting I'm missing.</p>
  
  <p>Any thoughts?</p>