CHM File not being displayed when clicking under Additional Topics

public sealed class CustomAddIn : AddIn
    {
        // Override methods in this class to register your extensions.
        protected override void RegisterHelp(HelpRegistrar registrar)
        {
            registrar.Register("My Custom Help Guide", "Custom TI Help Guide", "0");
        }
    }

I have got a sample CHM file from the internet. I have registered CHM as a public resource. I have my custom help guide, "My Custom Help Guide," shown under Additional Help Topics; however, when i click on the guide, nothing gets shown or the CHM doesnt get launched. 

 

I have used this method. When clicking on My Custom Help Guide, why is no file being shown at the screen?

On the Developer Tibco Manual, it mentions no usage of using an event handler. It says it should automatically be shown once clicked. 

 

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