You're correct, the Sorted property doesn't help. What I was thinking? :)
Try to put following code into the ListView Keypress

LPARAMETERS keyascii
IF BETWEEN( UPPER(CHR(keyascii)), "A", "Z")
	keyascii = 0
ENDIF	

>
>If I check it's value on the Keypress it is .F., and the items are not sorted.