Enumeration representing different selection modes for the grid elements if can be selected.

• 'none': No selection is allowed. Default row and column selection mode.
• 'single': Only one element can be selected at a time. Selecting a new one will deselect the previously selected one.
• 'multiple': Default cell selection mode. More than one element can be selected at a time.
• 'multipleCascade': Similar to multiple selection. It is used in hierarchical or tree grids. Allows selection not only to an individual item but also all its related or nested items in a single action