If you have to fill in some numbers there is no need for a extra keyboard.
You make first the virtual panel smaller to make some place for it.
Startup the program NumPad. And click on Move-button
And click Free-Move-button.
Place with the mouse in the right-bottom corner.
Click on the Fixed-button, the screen will jump up a little.
Adjust with the other buttons the proper position.
Click now on the Lock-button
And all is ready to use.
On the close of the Centroid program it will also automatically close.
I did put this on GitHub (source in VB.Net and compiled version) for free.
https://github.com/BigBoss57/Virtual-Numeric-Keypad-CNC
Disclaimer: You use this on your own risk.