How to - have a toolbar button displaying a GP value ?

Hi there,

I’d like a toolbar button, defined as a GP, to display it’s own value. using {theGPvalue} or $theGPvalue$ does not work.

Do you think it’s possible ?

My objective is to display a global property used as a modifier I can then call from the board, with a + or a - that will increase or decrease it’s own value by the modifier. This works fine, but so far I need to click on the toolbar button to see it’s value. I’d like it’s display to show it’s value.