Search Help via function module

Hi !

I developped a search-help exit like F4IF_SHLP_EXIT_EXAMPLE. And now I want to enable F4 value help for the rectriction parameters. I know this FM to enable required parameters ( F4UT_PARAMETER_REQUIRED) I need some similar to enable F4 help.

Could anyone lead me to some documents or some tips I that could be usefull to me ?

Thanks a lot,