Web Forms :: FindControl Does Not Working For Menu Childitems

I want to access child menuitem by name.not index number is it possible? This doesn't working
Menu menuLogin = (Menu)(LoginView1.FindControl("mLogin"));
MenuItem mi = menuLogin.FindItem("Register");
mi.text="Null Reference Exception here";

But this works:
Menu menuLogin = (Menu)(LoginView1.FindControl("mLogin"));
MenuItemCollection mic = menuLogin.Items[0].ChildItems;
MenuItem mi = mic[0]; mi.text="its OK";

I am looking something like this:
MenuItemCollection mic = menuLogin.Items[0].ChildItems;
MenuItem mi = mic["Register"];//or mic.finditem("Register") or so...
mi.text="its OK";