Userform textbox used as refedit

Click the start button.
change a value in textbox3 (that contains 20 when opening): e.g into 200
Look at the userform's caption.

Here is what I'd like to achieve with a textbox, however, I have probable not played enough with the concept to adapt it to what I require, but in any case, here is the site:

http://peltiertech.com/WordPress/ref...l-alternative/

SNB, thanks for the reply, I'll have a look at your suggestion as well.

Just a spanner in the works, if I start in a clean cell, and I start typing P for PI(), it gives me an error because it doesn't recognise the formula as a value, but rather as a string.

I'm trying to work around this but I am struggling with this. Even if you take let's say textbox1 and you select the cell and start clearing by pressing backspace, you get an error.