In the textbox gotfocus you could
ONKEY LABEL F8 MESSAGEBOX([F8 KEY PRESSED])
this.value won't work with on key, so a method would have to be DOed!
It could then be cleared in lostfocus.

>Hello Foxperts,
>
>I'm trying to capture the F8 keystroke and use it to replace the contents of a character field with another string that was saved in a memvar. Here's the code I've placed in the KeyPress event-method of the textbox:
>

LPARAMETERS nKeyCode, nShiftAltCtrl
>	WAIT "You Pressed "+TRANSFORM(nKeyCode) WINDOW NOWAIT   && for debug only
>IF nKeyCode=-7
>	NODEFAULT
>	oRec_mem.bwk_PlaceName=m.PlaceName
>	This.Refresh()
>ELSE
>	DODEFAULT(nKeyCode)
>ENDIF

>The WAIT ... WINDOW line shows me the nKeyCode for F7 and F9, but F8 returns nothing.
>
>UPDATE: F8 appeared to return nothing because an old ON KEY LABEL F8 DO ... was lurking in the dBASE/DOS program I've been trying to replicate in VFP. Thanks........ posting the problem solved it again!