In older versions of the modeler you had an option in a datagrid called: ' Select first'. This would automatically select the first row in the datagrid. Usefull if you use Listen to Grid dataviews in combination with the datagrid.
However, in the old case, the user is able to deselect the first row, causing the listen to grid dataview to become empty.
This new option fixes that, since the row isn't unselectable.