I usually use WPF to build any touch screen kiosk application we need. These application always need some type of touch screen entry.  I have in the past tried to used the built in touch screen keyboard(s) in Windows, but can never get them to behave well programmatically, or can get them to show/hide in an efficient manner.  Hence, I always have to built my own on-screen keyboard, or on-screen number pad, or on-screen keyboard/number pad.  So, what I really need in an on-screen keyboard/keypad/number pad:

1. the ability to programmatically show/hide the on-screen keyboard
2. would like to be able to configure it to show only the keys that I need, or at least the ability to show/not show the numbers row, show/not show a keypad with the keyboard, or only show/not show only a keypad (a number pad/no keyboard)
3. ability to programmatically hook into key entry, especially the enter key
4. it would be nice to show/hide at a location relative to the field accepting the key entry
5. theme it or it use the current theme