On-Screen keyboard and numeric keypad

Hi,

I have to develop an on-screen keyboard and on-screen numeric keypad for a touchscreen UI. The hardest thing with this is that it has to be multi-lingual.
Has anybody have ideas how to handle the strange characters of some languages and how to handle the different number of characters in the alphabet of some languages?

I've already started with the numeric keypad and I've changed the culture to "th-TH" for testing purposes. I noticed that the Thread.CurrentThread.CurrentUICulture.NumberFormat.NativeDigits string array contains all the numeric characters in the specific language, so I could use this to convert the numeric values on my numeric keypad to the characters in the correct language. Does anybody know a more simple way to achieve this... maybe by using formatting of doubles/ints to strings???

Thx for your answers,
Dennieku