To toggle the view of the expression's reference in 4D Write Pro, it can be done with the following:

1. Contextual click on the 4D Write Pro form object:




2. 4D Write Pro Toolbar:



3. 4D Write Pro widget:



It can also be done programatically using INVOKE ACTION:

INVOKE ACTION(ak show reference)

Here is an example of toggling a 4D Write Pro document with expressions: