Class: TEgDBGridEx
property CheckKind: TCheckKinds default ckCross;Selects the glyph drawn for a checked checkbox cell: a filled square
(ckSquare), a cross (ckCross), or a check mark
(ckCheck). Has no effect when CheckBoxes is
False. See TCheckKinds.
Overridable per column - see TEgColumn.CheckKind.