In order to select a full name in form I have textbox for the name and listbox in other place in form for the first name.

The listbox is only activated if more than one first name (for a name) exists like that :

texbox.ini()
local oLstBox
thisform.addobject("oLstBox","listbox")
thisform.oLstBox.tabindex = this.tabindex + 1
others properties defined here

and textbox.lostfocus()
Xnam = Enf.nam

Scan rest while Xnam = Enf.nam
thisform.oLstBox.additem(Enf.lastname)
endscan

if thisform.oLstBox.listcount > 1
thisform.oLstBox.visible = .T. && or enabled
endif

Thisform.oLstBox.clear
Thisform.oLstBox.visible = .F.


With textbox.keypress(), I can make a choice of name in all case.
All are OK, excepts that, in appropriate case, listbox appears and disappears without any possibilities to make a choice.

Where is my mistake ?
Thanks a lot.