Syringe Control is a developer tool that allows :

• loading Windows Forms control onto test surface;
• interacting with it for developer/tester;
• inspect and modify its public properties;

In these requirements it is similar with MS User Control Test Container included in Visual Studio distribution. The main difference is that Syringe Control can provide required dependencies to tested control either via DependencyInjection (DI) or via standard Component.GetService() call so that much more sophisticated controls can be tested.