How to get handle to webpart in WebPartZone?

Hi

I have a class which is derived from WebPartZone class. As follows.

LeanWebPartZone : Microsoft.Web.Preview.UI.Controls.WebParts.WebPartZone

In this class, I want to set the helpVerb for providing unique helpPage URL for that webpart. Now, on one webpage I have multiple webparts and each webpart might have different helpPage URL. So, my problem is that, at any given time in LeanWebPartZone class, how do I know for which WebPart I am setting the HelpVerb?

Please advise. Thanks

Pankaj