I am developing a Custom Control to be used by other developers in the .NET environment.
My implementation is developed in .NET 2005 C++ -- development is going well but I have had some issues that I cannot resolve.

For example, when installing third part controls I notice in the Properties Tab they have their properties listed in a heading of some name other than those the control may inherit from. For example the generic ones include 'Data', 'Design', 'Focus', 'Layout' etc.

How do I add one of my own?

Thanx.