Visible comments in a component

I wonder how you add comments in a component that shows up as an description of a method, property or event when it is selected

A better desription:
1. You make a component that contains some methods and properties
2. You import the component in a new project
3. You make an instance of a class in your component aClass objC = new aClass()
4. Via the instance you call a method objC.aMethod()
5. After you been writing the instance name (objC.), you add a dot and then a menu shows up where you can select a method, property or event within the instance.
6. When e.g. a method is selected there's a descriping text that tells you what the method do; that's the text I wonder how I'm going to add in a component!

I've been making components and been adding the XML comments (///<summary>) but this doesn't show up when importing the component in a new project.

Regards,
Nick