How to implement key event for button click event

Question

Hi everybody!

I'm writing a virtual keyboard, and i have a problem.

As we know when press a key on real keyboard, control which focused will receive key event (defined by .Net)

for example:

you focus in a Multi line textbox, when you press key Enter. textbox will add 1 line and show cursor at that line.

. I think that textbox will receive Enter 's key code , after that textbox will perform 1 action with this Enter keycode. 

so now i want to know that how to implement key event from buttton click event for a control. 

Please help me! Thanks!!!

Kind regards.

Sugia