there is lot's of confusion/mistakes while changing Namesapce & Module name so i update question with actual name and proving more details about models , also include with suggestion of answer Marius but problem is same.

i also try resource instead of mysql4 but same problem, i also updated the question

@FROSIT Module_Namespace is just mistake in question typing, but not in actual files, i already developing grid by following this inchoo article you describe

last time i missed some points in question by mistake , so i edited the question

last time i missed some points in question by mistake , so i edited the question