Unable To call function from URL

[eluser]Blue Sapphire[/eluser]
Thanks for guidance. I have following scenario:

1- 'admin' is sub directory of 'controllers' directory. 'admin' directory will hold all admin related controllers.

2- 'main' is default controller in 'admin' sub directory. There will be many more controllers in 'admin' sub directory.

3- 'myFunc' is function in 'main' controller.

Your guidance will be higly appreciated in this scenario.

Thanks in advance