Hide Text box after entering a number

Hi

I can manage to move focus between two text boxes but I'd really like Box 1 to open and close not shift focus (become invisible, not showing on screen) after entering a number and then visible again when I click the button to make another edit.

If you could answer with a Block example I'd be grateful as a complete novice.

Here is my block -

Rex

Use the visible property for each textbox.

Something like this:

image

Lovely, does just what I wanted.

Rex