How to convert delegate to identical delegate?

There are two descriptions of the delegate: first, in a third-party assembly:

public delegate void ClickMenuItem (object sender, EventArgs e)

second, the standard:

public delegate void EventHandler (object sender, EventArgs e);

I'm trying to write a method that will receive a parameter of type EventHandler and will call third-party library, with the parameter ClickMenuItem.

How to convert the ClickMenuItem to EventHandler?