how to find the master page's web user control in child page

Question

hi
i have one web user control that is products.ascx i use this as a banner in my master page i want to access this user control in some other pages for this i use the following code that is

master.findControl("myControl") but , i am unable to convert this to my products because vs not show that control (like any other asp.net control) how to i solve my task.