Cannot change the position of buttons.

Hi All.
I am working in a calculator
https://play.google.com/store/apps/details?id=rpn.calculator
and I decide to put the "+" button in the place of the "/" button etc.
But when I compile the code, the buttons go back to where they were
before. Of course I save the layout. It is just amazing. Even deleting the buttons
and creating other with other names and they appear with the position of the deleted ones.

It was that thing of "Layout variants". :sign0013:
Sorry for this. Please, delete this topic.

You could also have a look at this RPNCalc.

Best regards.

Dear Klaus.
Thank you!
Very interesting calculator, I will take a look.
Best wishes.
José L.

P.S. In my calculator I used a minimalistic aproach. I want it to be very visible in 3", 240x320. Even the best rpn calculator I know, the Free42, is not so great in this situation.