Need simple calculator program

I am looking for a simple calculator program to incorporate into my application. I only need the basic arithmetical calculations. Storing some numbers (M+, M-, etc) would be nice, but not mandatory. I need one where I would have a royalty-free license, etc.

I could use the one that Microsoft included in my Visual Basic CDs but I want to be able to paste the result into the textbox that I just left. I have set the textbox on Form1 up so that a double click of that textbox calls up the Calculator, but the Calculator will not paste the Calculator result into the textbox.

I also want to be able to enter the numbers and operators by keyboard as well as by mouse.

Thanks.

If you modify the Calculator program shipped with VB, you can do this. Simply change the Label to a TextBox (so you can paste) and use the KeyPress event of the Form to