FarPoint.Win.Spread.CellType.CheckBoxCellType ckbxcell = new FarPoint.Win.Spread.CellType.CheckBoxCellType();
ckbxcell.ThreeState = true;
ckbxcell.TextTrue ="Checked";
ckbxcell.TextFalse ="Unchecked";
ckbxcell.TextIndeterminate = "Not Sure";
fpSpread1.Sheets[0].Cells[1,2].CellType = ckbxcell;
Dim ckbxcell As New FarPoint.Win.Spread.CellType.CheckBoxCellType()
ckbxcell.ThreeState = True
ckbxcell.TextTrue = "Checked"
ckbxcell.TextFalse = "Unchecked"
ckbxcell.TextIndeterminate = "Not Sure"
fpSpread1.Sheets(0).Cells(1,2).CellType = ckbxcell