Creating a Check Box Cell and Setting Its Type
Overview
By default, check box cells provide two-state check boxes, which can be either True or False. You can provide a three-state check box instead, which can be either True, False, or Grayed. The grayed state is an indeterminate state. An example of when the check box might be grayed is when it represents whether text is bold, and in the current selection, some text is bold and some is not.
You can horizontally and vertically align the check box and text within the cell.