Hi Joshua,
You need to code in GET_V method and just take help of an search help (for example WDR_TEST_DATE) and create an F4 instance with iv_trigger_submit = abap_true.
DATA:
ls_map TYPE if_bsp_wd_valuehelp_f4descr=>gtype_param_mapping,
lt_inmap TYPE if_bsp_wd_valuehelp_f4descr=>gtype_param_mapping_tab,
lt_outmap TYPE if_bsp_wd_valuehelp_f4descr=>gtype_param_mapping_tab.
ls_map-context_attr = 'struct.date.
ls_map-f4_attr = 'FLDATE'.
APPEND ls_map TO: lt_outmap.
CREATE OBJECT rv_valuehelp_descriptor TYPE
cl_bsp_wd_valuehelp_f4descr
EXPORTING
iv_help_id = 'WDR_TEST_DATE'
iv_help_id_kind = if_bsp_wd_valuehelp_f4descr=>help_id_kind_name
iv_input_mapping = lt_inmap
iv_output_mapping = lt_outmap
iv_trigger_submit = abap_true.
Thanks & Regards
NIkhil H