checkbox in stringgrid ......................\Project1.cfg ......................\Project1.dof ......................\Project1.dpr ......................\Project1.exe ......................\Project1.res ......................\Unit1.dcu ......................\Unit1.ddp ......................\Unit1.dfm ......................\Unit1.pas ......................\Unit1.~ddp ......................\Unit1.~dfm ......................\Unit1.~pas