I don't think that this is possible using a normal string entry field. There is no event activated by single characters.
However, you could possibly create an on-screen "keyboard" using the form grid feature to get around the problem.
Let us all know how you end up achieving this.
Kulik, Andreas wrote:
begin:vcard fn:Dave Elder n:Elder;Dave org:Tait Electronics adr:;;PO Box 1645;Christchurch;;;New Zealand email;internet:dave.elder@xxxxxxxxxx title:PCB Design Manager tel;work:+64 3 3580327 tel;cell:+64 21 37 37 25 url:http://www.taitworld.com version:2.1 end:vcard