To achieve a withdrawal and redo feature provides a good example of the second platform for system development, providing help

Netron3
.......\Applications
.......\............\Yttrium
.......\............\.......\Yttrium.Library
.......\............\.......\...............\analysis.FxCop
.......\............\.......\...............\AssemblyInfo.cs
.......\............\.......\...............\Backend
.......\............\.......\...............\.......\Channels
.......\............\.......\...............\.......\........\AbstractChannel.cs
.......\............\.......\...............\.......\........\CommandChannel.cs
.......\............\.......\...............\.......\........\CommandReference.cs
.......\............\.......\...............\.......\........\Commands
.......\............\.......\...............\.......\........\........\AbstractBusCommand.cs
.......\............\.......\...............\.......\........\........\AbstractCommand.cs
.......\............\.......\...............\.......\........\........\AbstractNewCommand.cs
.......\............\.......\...............\.......\........\........\AbstractPortBusCommand.cs
.......\............\.......\...............\.......\........\........\AbstractPortBusIndexCommand.cs
.......\............\.......\...............\.......\........\........\AbstractPortCommand.cs
.......\............\.......\...............\.......\........\........\AbstractPortIndexCommand.cs
.......\............\.......\...............\.......\........\........\AbstractPortSignalCommand.cs
.......\............\.......\...............\.......\........\........\AbstractPortSignalIndexCommand.cs
.......\............\.......\...............\.......\........\........\AbstractSignalCommand.cs
.......\............\.......\...............\.......\........\........\BusDrivePortCommand.cs
.......\............\.......\...............\.......\........\........\BusUndrivePortCommand.cs
.......\............\.......\...............\.......\........\........\CommandBase.cs
.......\............\.......\...............\.......\........\........\NewBusCommand.cs
.......\............\.......\...............\.......\........\........\NewPortCommand.cs
.......\............\.......\...............\.......\........\........\NewSignalCommand.cs
.......\............\.......\...............\.......\........\........\PortDriveSignalCommand.cs
.......\............\.......\...............\.......\........\........\PortUndriveSignalCommand.cs
.......\............\.......\...............\.......\........\........\RemoveBusCommand.cs
.......\............\.......\...............\.......\........\........\RemovePortCommand.cs
.......\............\.......\...............\.......\........\........\RemoveSignalCommand.cs
.......\............\.......\...............\.......\........\........\SignalDrivePortCommand.cs
.......\............\.......\...............\.......\........\........\SignalUndrivePortCommand.cs
.......\............\.......\...............\.......\........\Hint.cs
.......\............\.......\...............\.......\........\HintChannel.cs
.......\............\.......\...............\.......\........\HintType.cs
.......\............\.......\...............\.......\........\ICommand.cs
.......\............\.......\...............\.......\........\ISystemObserver.cs
.......\............\.......\...............\.......\........\LogObserver.cs
.......\............\.......\...............\.......\........\Mediator.cs
.......\............\.......\...............\.......\Containers
.......\............\.......\...............\.......\..........\ArchitectureTable.cs
.......\............\.......\...............\.......\..........\BusSet.cs
.......\............\.......\...............\.......\..........\EntityTable.cs
.......\............\.......\...............\.......\..........\IdentifierDictionary.cs
.......\............\.......\...............\.......\..........\InstanceIdSet.cs
.......\............\.......\...............\.......\..........\PortSet.cs
.......\............\.......\...............\.......\..........\PropertyProviderTable.cs
.......\............\.......\...............\.......\..........\SignalSet.cs
.......\............\.

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