The cell types have been moved to the CellTypes namespace.

V11	V9
GC.Spread.Sheets.CellTypes.Base	GcSpread.Sheets.BaseCellType
GC.Spread.Sheets.CellTypes.CheckBox	GcSpread.Sheets.CheckBoxCellType
GC.Spread.Sheets.CellTypes.Button	GcSpread.Sheets.ButtonCellType
GC.Spread.Sheets.CellTypes.HyperLink	GcSpread.Sheets.HyperLinkCellType
GC.Spread.Sheets.CellTypes.ComboBox	GcSpread.Sheets.ComboBoxCellType
GC.Spread.Sheets.CellTypes.HyperLinkTargetType	GcSpread.Sheets.HyperLinkTargetType
GC.Spread.Sheets.CellTypes.EditorValueType	GcSpread.Sheets.EditorValueType

The allowEditorReservedLocations method and the CustomCellType class have been removed.