In the v17.0.2 can not display the drop-down list of the combo box ?

[rcihie]

in the v16, I use the combo Box Properties CTL_LISTBOX p_cb_list_box, the p_cb_list_box.p_visible = 1 drop-down list of the combo box can display.
In the v17.0.2 , p_cb_list_box.p_visible = 1 can not display the drop-down list of the combo box. In the v17.0.2, how to display the drop-down list? (Combo Box call_event 'F4' does not meet my needs, I do not want the focus to the combo box).
thanks.