Allows a designer to add to the set of properties that it exposes through a System.ComponentModel.TypeDescriptor.
This method provides a way to add items to the dictionary of properties that a designer exposes through a System.ComponentModel.TypeDescriptor.
The keys in the dictionary of properties are the names of the properties. The objects are of type System.ComponentModel.PropertyDescriptor. This method is called immediately before the ComponentDesigner.PostFilterProperties(IDictionary) method.