title: Selecting multiple items in DataGrid on click
body: <p>In an WPF <code>DataGrid</code> I want to select multiple items when clicking on an item. I tried doing this by manually setting the <code>DataGrid</code>s <code>SelectedItems</code> in the <code>CurrentCellChanged</code>-event and in the <code>SelectionChanged</code>-event, but the <code>SelectedItems</code> will be reset after the event handling. How could I do this?</p>