How debug

Question

hi,
now i create a new custom rule in FxCop. i intergrde also. bt my codes not works. so i have to debug my code and check step by step. actually thi is .DLL package, if i debug it says cant debug library package.. ppl any body can explain me hw to debug library packages?

NOTE: i read http://blogs.msdn.com/fxcop/archive/2007/05/16/faq-how-do-i-debug-a-custom-rule.aspx this document and follow up. bt no use.