When overridden in a derived class, allows a designer to add items to the set of properties that it exposes through a TypeDescriptor.
Assembly: System (in System.dll)
This method provides a way to add items to the dictionary of properties that a designer exposes through a TypeDescriptor.Notes to Implementers
You can directly modify the dictionary that is accessible through the properties parameter, or you can leave it unchanged. If you are overriding this method, call the base implementation before you perform your own filtering.