AsBoolean
Specifies Boolean representation of value.property AsBoolean: Boolean read GetAsBoolean write SetAsBoolean;This property is most suitable for Check-box column type.
Example:
// get value
if not NextGrid1.CellByName['First', 'Selected'].AsBoolean then...
// set value
NextGrid1.Cell[0, NextGrid1.LastAddedRow].AsBoolean := True;