I have a textbox that will have text in it. (That's it's purpose, right?)

I want my users to press a command button, and insert a number into the text at the point where the cursor was.

For example, if I have "My name is Fred" in the textbox, and the cursor is between the N and A in name, when the user presses the button 2, I want the textbox to read "My n2ame is Fred"

Anyone have any idea how to do this?

Thanks!