Access Master Page Controls in Content Pages in ASP.Net

Hi,

       Today I got a strange problem,that is I am unable to access master page controls in its code behind,I am wonder because,I can able to access master page controls in their code behind of other projects/applications's master pages.

I know we can acess like this Label lblText = (Label)this.FindControl("lbluserName"); in that situation but I need to access div controls which are set to run at server.Thanks in advance.