"none" - disables the selection. Selection is possible only through the API.
"singlerow" - full row selection. Each click changes the selected row.
"multiplerows" - each click selects a new row. Click on a selected row unselects it.
"multiplerowsextended" - users can select multiple rows with drag and drop or
by clicking on rows while holding Ctrl or Shift.
Selected Row Index:
Unselected Row Index: