Webdynpro event call

  I have two buttons in Webdynpro view Button A and Button  B.

I have a mehod for Button A and I need to call this method in button B.

But using wizard i tried it, but when I tried to call a Button A method which is an event handler and it is asking me to fill wd_event type ref to  Cl_wd_event.

So what value should I pass. to wd_event?

Thanks

Vijay