Extending the Toolbox
The Visual Studio Toolbox provides a collection of objects that provide functionality to editors and designers through the IDE's drag-and-drop mechanism.
There are two basic ways in which a VSPackage works with the Visual Studio Toolbox:
A VSPackage can add new data items and controls to the Toolbox.
A VSPackage can be a target or consumer of existing Toolbox functionality, supporting the drag-and-drop operations and configuring the Toolbox's appearance.