Hi Peter,
If you like to try only the gannt engine... using this add-ins you can customize your WSB as per to your requirements and this tool will synchronize to all documents and if you are not satisfied try also Mindjet Connect the best tool for Project Management & Collaboration.
Gannt for .NET 3.0 Scheduling Engine Gannt for dot Net 3.0 offers server-side and client-side project planning and scheduling options for crafting and forecasting projects. Through integrated integration with with VSTE, application developers can [modify] data connections, planning algorithms, UI and behaviour, plus rapidly configure and deploy an appropriate project timeline management solution.
Regards,
Reno