In order to support WPF and Silverlight, the core API has been separated from the GDI+ and Windows Forms APIs and therefore uses the new SpreadsheetGear.Color type rather than SpreadsheetGear.Drawing.Color. SpreadsheetGear.Drawing.Color has been moved to SpreadsheetGear2012.Drawing.dll. See SpreadsheetGear.Drawing.Color for an example which uses the implicit and static converters to convert between SpreadsheetGear.Color, SpreadsheetGear.Drawing.Color and System.Drawing.Color. SpreadsheetGear.Colors and SpreadsheetGear.SystemColors provide helpful predefined colors to replace the use of predefined colors in System.Drawing.Color.
The SpreadsheetGear command classes have been moved from the SpreadsheetGear.Windows.Forms namespace to SpreadsheetGear.Commands to enable sharing by the Windows Forms, WPF, and Silverlight WorkbookView controls.